Which CPU build to pick: 1800x vs 2700x vs 8/9600k vs 7800x vs 8700k vs 9700k

[horche]

Hey guys! So I am building a PC and I am not quite sure on which build to pick. Here where I live, prices are really strange and now with all the 14nm production crisis, they are out of the roof. I have picked some of my parts and I already have them by me.

GPU: EVGA GTX 1080 acx 3.0
RAM: DDR4 G.SKILL TridentZ RGB Series 16GB (2 x 8GB) 3200 CL16
SSD: SAMSUNG 860 EVO Series 2.5" 500GB SATA III V-NAND

Parts I plan to buy:

Case: Fractal Design Meshify C - Dark TG
Cooler: Be quiet! Dark Rock Pro 4
PSU: EVGA SuperNova 650 G3

What I plan to do with this build first and foremost is gaming. I will be using a 1080p 120ghz monitor and my targeted fps is 100 and above @1080p. I plan to video edit and I will be overclocking my CPU, GPU and RAM for maximum performance. I may stream but only if my build allows me to. I am new to streaming so I may just try it out. As I have said the prices where I live are awful when it comes to CPUs. My best choise was the 8700k but it's price tag is 560USD. 8600k/9600k are at 360$ both. The 9700k isn't available yet and the 7800x is strangely low at 390$. For AMD- 310$ for the 1800x and the 2700x is @390$. My MOBO choise for the 8700k/9/8600k/9700k is the GB Z390 Aorus Pro (240$). For the AMD CPUs- MSI B450 Tomahawk (120$). I am open for suggestions on the MOBO part. And for the 7800x my cheapest alternative is the GB x299 UD4 (240$). The parts I have already bought are unpacked so I wounder if I should sell my gtx 1080 and get a 2070 at roughly the same price.

 

[feelinfroggy777]

2700x is too good of a CPU for too good of a price. Its gaming performance will be a few % behind Intel. The few fps difference is just not worth the extra cost. Espeically when you consider the additional cost of a CPU cooler as the 2700x comes with a decent stock cooler. For workstation task such as video editing, the extra cores of the 2700x really shine.

 

[TJ Hooker]

https://www.tomshardware.com/reviews/intel-core-i9-9900k-9th-gen-cpu,5847-13.html

Contains average and minimum framerate comparison chart for most of those CPUs, at least at stock clocks.

For pure gaming I think the 9600K might be the best bang for buck. If you consider video editing/streaming, the 1800X probably offers the best performance per dollar.

 

[geofelt]

The parts you already have are good.

If your primary use was for editing and other batch tasks that can use many threads, then ryzen of some sort would be best.
You get many threads for good value.

OTOH, Intel will overclock higher, perhaps as good as 5.0 on a i5-8600K or i5-9600K.
The 9600K with revised heat spreader looks to be the easier overclocker.
Few games can actually make good use of more than 2-3 threads. 6 should be plenty.

On the motherboard, there is little reason to buy a premium board. Asrock seems to give decent results and is usually cheaper.
You might find M-ATX at a good price.
Z370 would run either 8th or 9th gen, but try to stick with the Z390 motherboards.
Their power design seems to be more robust for not a big price premium. You might need that if you ever upgrade to i9-9900K.

I would not rush to sell the GTX1080.
EVGA has a 90 day step up program which you might be able to use to get full value of the GTX1080 if a GTX2070 is considered as a step up.
Seems more sideways to me.

 

[horche]

So I am looking at around 10-15fps less if I go with the 2700x. My main focus for this build is gaming, so I will be getting more performance in gaming strictly if I go with the 8/9600k but it won't be as futureproof-ed. Let's say I get a new gpu in 2 years which is 50% faster then the 1080, will I get a big bottleneck with the 2700x? What mobo do you guys suggest with the 2700x, and how does the 2700x stack against the 1800x?

 

[JamesSneed]

Since you want high FPS at 1080p I would go with the 8700k. Its being discounted a bit now and can be had for
$380 which makes it a pretty good deal.

https://www.newegg.com/Product/Product.aspx?Item=N82E16819117827&cm_re=8700k-_-19-117-827-_-Product

 

[TJ Hooker]

@JamesSneed the OP lists the prices available to him in the first post. The 8700K would run him 560 USD.

 

[geofelt]

Some games are graphics limited like fast action shooters.
Others are cpu core speed limited like strategy, sims, and mmo.
Multiplayer tends to like many threads.

What is your favored type?

Ryzen x processors can be overclocked. Perhaps 4.1-4.2 with a good chip.
The intel K processors will do 5.0 with a good chip.

You will not likely have a problem with any of the choices you listed.

There really is no such thing as "future proofing" whatever that means.
Products and prices change quickly.

Neither is "bottleneck" a good term.
If, by that, you mean that upgrading a cpu or graphics card can
somehow lower your performance or FPS.
A better term might be limiting factor.
That is where adding more cpu or gpu becomes increasingly
less effective.

For the future, you have announced and available strong graphics upgrades in the RTX2080 /GTX2080ti.
Possibly, amd might finally deliver something competitive.
For fast action games or high resolutions, the graphics card is going to be the primary limiter of performance.


On the cpu side, AM4 motherboards will support the 2700x as the top gaming processor.
There are rumors of a 2800X, but specs are unknown.

If you buy a Z390 motherboard, you have an upgrade announced and somewhat available in the i9-9900K.
No telling if we will see a 10nm processor soon. I am guessing that the z390 chipset is what it will need.

As to how many threads future games will need, I am not so certain that many threads will be required.
Game developers do not want to restrict their market.
4 threads are currently the highest game requirement I know of.
Then, the question becomes how many threads can be effectively used to improve performance.
I think you will see that it is multiplayer games that responds well to many threads.
Unfortunately such benchmarks are hard to come by.

 

[horche]

What I ment to ask is if I am using a 1080 with a 2700x or 8700k will the yield difference in fps be smaller then let's say using 2080Ti with a 2700x and 8700k. If that's true then it means that the difference will only grow when I use more powerful videocards in the future. That's what I ment by bottleneck. If I chose the 2700x which mobo is best to pick, which chipset, B350/450 or X370/470.

 

[horche]

bump

 

[feelinfroggy777]

What I ment to ask is if I am using a 1080 with a 2700x or 8700k will the yield difference in fps be smaller then let's say using 2080Ti with a 2700x and 8700k. If that's true then it means that the difference will only grow when I use more powerful videocards in the future. That's what I ment by bottleneck. If I chose the 2700x which mobo is best to pick, which chipset, B350/450 or X370/470.

I will begin to come down to resolution when you start looking at GPUs as powerful as the 2080ti. At 1080p, the bottleneck is on the CPU because the GPU does not have as many pixels to render. But the new 2080ti really takes a performance hit at 1080p because there is not a CPU in the world that can keep up with it at the "low" resolution.

If you are wanting a GPU that is faster than a 1080, then you really should begin looking at gaming at a higher resolution (1440p, 4k). When you move into those higher resolutions, the CPU becomes less important.

If it were me, I would buy the 2700x. The performance difference is too small and the price difference is too big. The AM4 socket will be supported through 2019, so there is an upgrade path when AMD's 7nm CPUs come out. Many speculate that AMD's 7nm Ryzen CPUs will surpass Intel in performance. In the past, Intel has required mobo upgrades for next gen CPUs. So if you buy Intel now, if you want to upgrade later, you may need to buy another mobo too.

As far as mobos, I like the MSI b450 Tomahawk. It is a good price for a decent midrange motherboard.

 

[horche]

I will begin to come down to resolution when you start looking at GPUs as powerful as the 2080ti. At 1080p, the bottleneck is on the CPU because the GPU does not have as many pixels to render. But the new 2080ti really takes a performance hit at 1080p because there is not a CPU in the world that can keep up with it at the "low" resolution.

If you are wanting a GPU that is faster than a 1080, then you really should begin looking at gaming at a higher resolution (1440p, 4k). When you move into those higher resolutions, the CPU becomes less important.

If it were me, I would buy the 2700x. The performance difference is too small and the price difference is too big. The AM4 socket will be supported through 2019, so there is an upgrade path when AMD's 7nm CPUs come out. Many speculate that AMD's 7nm Ryzen CPUs will surpass Intel in performance. In the past, Intel has required mobo upgrades for next gen CPUs. So if you buy Intel now, if you want to upgrade later, you may need to buy another mobo too.

As far as mobos, I like the MSI b450 Tomahawk. It is a good price for a decent midrange motherboard.

All clear now. I think I have made my mind and will go for the 8700k. I found it online for 430$ from a neighbour country that also covers the shipment. The 2700x would be my second choice if something else fails. There is no need for me to jump from 1080 to 2070 when it comes to gaming at 1080p as the difference is 5% when both overclocked. My PSU choice is good so I will leave it at that 650W should be enough for both my cpu and gpu to be overclocked. But I was wondering if the cpu cooler is fine as I have heard it's too big and will disturb my RAM clearance. I am open to suggestions for my cooler, case and mobo (for the i7) that are compatible with each other when put together.

 

[feelinfroggy777]

The 8700k is a great CPU. I have it in my gaming rig. I just like the value of the 2700x. But comparing these CPUs is like comparing a Ferrari and a Lamborghini. They are all very good CPUs.

The Dark Rock Pro 4 will work. You will probably have to adjust the fan to get it to fit. Below is a link to a review and they used the same GSkill Trident Z RAM that you are using and they got it to fit by adjusting the positioning of the front fan a few milimeters.

https://hexus.net/tech/reviews/cooling/116351-quiet-dark-rock-pro-4/

 

[JamesSneed]

I will begin to come down to resolution when you start looking at GPUs as powerful as the 2080ti. At 1080p, the bottleneck is on the CPU because the GPU does not have as many pixels to render. But the new 2080ti really takes a performance hit at 1080p because there is not a CPU in the world that can keep up with it at the "low" resolution.

If you are wanting a GPU that is faster than a 1080, then you really should begin looking at gaming at a higher resolution (1440p, 4k). When you move into those higher resolutions, the CPU becomes less important.

If it were me, I would buy the 2700x. The performance difference is too small and the price difference is too big. The AM4 socket will be supported through 2019, so there is an upgrade path when AMD's 7nm CPUs come out. Many speculate that AMD's 7nm Ryzen CPUs will surpass Intel in performance. In the past, Intel has required mobo upgrades for next gen CPUs. So if you buy Intel now, if you want to upgrade later, you may need to buy another mobo too.

As far as mobos, I like the MSI b450 Tomahawk. It is a good price for a decent midrange motherboard.

All clear now. I think I have made my mind and will go for the 8700k. I found it online for 430$ from a neighbour country that also covers the shipment. The 2700x would be my second choice if something else fails. There is no need for me to jump from 1080 to 2070 when it comes to gaming at 1080p as the difference is 5% when both overclocked. My PSU choice is good so I will leave it at that 650W should be enough for both my cpu and gpu to be overclocked. But I was wondering if the cpu cooler is fine as I have heard it's too big and will disturb my RAM clearance. I am open to suggestions for my cooler, case and mobo (for the i7) that are compatible with each other when put together.

Someone should upvote me on this recommendation, cough TJ cough. Good find and good choice for what you are wanting gaming wise.

 

[horche]

Ok it's me again. I've been waiting patiently for the prices to drop for this black friday. I have ordered the NCIX s340 Elite case in black (70$ deal) but I have been wondering if I should go with the 8700k or 9700k. The price for the 8th gen is 450$ and for the newer one- 500$. So the difference is 50$ I plan to delid the 8700k and based on benches and forum threads I have concluded that the 9700k won't need a delid but it would need a better cpu cooler as it runs hotter (+2cores). If I go for the 8th series I will pair with an AIO 240mm cooler as I believe it will be enough after delid and if I go with the 9th series I will get a Dark Rock pro 4. The thing is that I don't want my cooler to hide my RGB RAM. So my question is it really worth it to get a 8700k over 9700k? Which is better 2 more cores or 4 more threads? Based on benchmarks they both have the exact same perf when at the same clock speed. I have found a good deal on a PSU so instead of EVGA I plan to order Seasonic Focus plus. 650W should be enough right?

 

[vMax]

Ok it's me again. I've been waiting patiently for the prices to drop for this black friday. I have ordered the NCIX s340 Elite case in black (70$ deal) but I have been wondering if I should go with the 8700k or 9700k. The price for the 8th gen is 450$ and for the newer one- 500$. So the difference is 50$ I plan to delid the 8700k and based on benches and forum threads I have concluded that the 9700k won't need a delid but it would need a better cpu cooler as it runs hotter (+2cores). If I go for the 8th series I will pair with an AIO 240mm cooler as I believe it will be enough after delid and if I go with the 9th series I will get a Dark Rock pro 4. The thing is that I don't want my cooler to hide my RGB RAM. So my question is it really worth it to get a 8700k over 9700k? Which is better 2 more cores or 4 more threads? Based on benchmarks they both have the exact same perf when at the same clock speed. I have found a good deal on a PSU so instead of EVGA I plan to order Seasonic Focus plus. 650W should be enough right?

I would go the 8700K route as it performs amazingly well and keeps up with the 9th gen CPU's at gaming. More over it overclocks extremely well and if you plan on delidding which I have done, it is even better. Also delidding was a loit easier than I thought it would be! I dropped 18 degrees C and have it running at 4.9GHz for a 24/7 overclock at 1.278v...5GHz was easy as was 5.1GHz but I do not like vcore over 1.325 for 24/7...yes I am a scaredy cat!!!

Both the 9700K and the 8700K will do a great job on the gaming front but the 8700K might just be better on the streaming front with it's extra threads...either way, you can't go wrong...

 

[horche]

Ok it's me again. I've been waiting patiently for the prices to drop for this black friday. I have ordered the NCIX s340 Elite case in black (70$ deal) but I have been wondering if I should go with the 8700k or 9700k. The price for the 8th gen is 450$ and for the newer one- 500$. So the difference is 50$ I plan to delid the 8700k and based on benches and forum threads I have concluded that the 9700k won't need a delid but it would need a better cpu cooler as it runs hotter (+2cores). If I go for the 8th series I will pair with an AIO 240mm cooler as I believe it will be enough after delid and if I go with the 9th series I will get a Dark Rock pro 4. The thing is that I don't want my cooler to hide my RGB RAM. So my question is it really worth it to get a 8700k over 9700k? Which is better 2 more cores or 4 more threads? Based on benchmarks they both have the exact same perf when at the same clock speed. I have found a good deal on a PSU so instead of EVGA I plan to order Seasonic Focus plus. 650W should be enough right?

I would go the 8700K route as it performs amazingly well and keeps up with the 9th gen CPU's at gaming. More over it overclocks extremely well and if you plan on delidding which I have done, it is even better. Also delidding was a loit easier than I thought it would be! I dropped 18 degrees C and have it running at 4.9GHz for a 24/7 overclock at 1.278v...5GHz was easy as was 5.1GHz but I do not like vcore over 1.325 for 24/7...yes I am a scaredy cat!!!

Both the 9700K and the 8700K will do a great job on the gaming front but the 8700K might just be better on the streaming front with it's extra threads...either way, you can't go wrong...

I was thinking the same thing! I do want to stream from time to time, but I haven't been able to find benchmarks that put both cpus at test strictly in streaming. More what I have found is that the 8700k tends to have a lower CPU usage when gaming next to the 9700k, which let's me believe that the 8th series will perform better in multitask. What worries me is that in the next 2-3 years games may tend to run better on higher core count processors, which may give the 9700k an edge, but we can only speculate. What cpu cooler are you using? I plan to get arctic freezer 240, cooler master 240 or thermaltake extreme s. For mobo I will go with the Asus Strix z390-F

 

[vMax]

Ok it's me again. I've been waiting patiently for the prices to drop for this black friday. I have ordered the NCIX s340 Elite case in black (70$ deal) but I have been wondering if I should go with the 8700k or 9700k. The price for the 8th gen is 450$ and for the newer one- 500$. So the difference is 50$ I plan to delid the 8700k and based on benches and forum threads I have concluded that the 9700k won't need a delid but it would need a better cpu cooler as it runs hotter (+2cores). If I go for the 8th series I will pair with an AIO 240mm cooler as I believe it will be enough after delid and if I go with the 9th series I will get a Dark Rock pro 4. The thing is that I don't want my cooler to hide my RGB RAM. So my question is it really worth it to get a 8700k over 9700k? Which is better 2 more cores or 4 more threads? Based on benchmarks they both have the exact same perf when at the same clock speed. I have found a good deal on a PSU so instead of EVGA I plan to order Seasonic Focus plus. 650W should be enough right?

I would go the 8700K route as it performs amazingly well and keeps up with the 9th gen CPU's at gaming. More over it overclocks extremely well and if you plan on delidding which I have done, it is even better. Also delidding was a loit easier than I thought it would be! I dropped 18 degrees C and have it running at 4.9GHz for a 24/7 overclock at 1.278v...5GHz was easy as was 5.1GHz but I do not like vcore over 1.325 for 24/7...yes I am a scaredy cat!!!

Both the 9700K and the 8700K will do a great job on the gaming front but the 8700K might just be better on the streaming front with it's extra threads...either way, you can't go wrong...

I was thinking the same thing! I do want to stream from time to time, but I haven't been able to find benchmarks that put both cpus at test strictly in streaming. More what I have found is that the 8700k tends to have a lower CPU usage when gaming next to the 9700k, which let's me believe that the 8th series will perform better in multitask. What worries me is that in the next 2-3 years games may tend to run better on higher core count processors, which may give the 9700k an edge, but we can only speculate. What cpu cooler are you using? I plan to get arctic freezer 240, cooler master 240 or thermaltake extreme s. For mobo I will go with the Asus Strix z390-F

Yep it is confusing with all the choice we now have, something we did not until AMD and Ryzen came back strong...As to the CPU cooler, I have gone the whole nine yards with the Corsair H150i Pro...the 360mm AIO...And yes is is simply fantastic and maybe overkill but will come in handy when I get a 9900K...if it ever drops in price in 2 to 3 years..

As to motherboard, I am on the Gigabyte Z370 Gaming 7 which is great but for you a Z390 will be better. Interestingly Gigabyte seem to have the upper hand in this round with a great VRM setup for overclocking...See this video by Buildzoid that came out today on the Z390's..

https://www.youtube.com/watch?v=v5NDtS8za8g

 

[jackstas]

i would just buy a i9 9900k, then ur good for upgrading to the new rtx ti in the future and for 4k

 

[geofelt]

Ok it's me again. I've been waiting patiently for the prices to drop for this black friday. I have ordered the NCIX s340 Elite case in black (70$ deal) but I have been wondering if I should go with the 8700k or 9700k. The price for the 8th gen is 450$ and for the newer one- 500$. So the difference is 50$ I plan to delid the 8700k and based on benches and forum threads I have concluded that the 9700k won't need a delid but it would need a better cpu cooler as it runs hotter (+2cores). If I go for the 8th series I will pair with an AIO 240mm cooler as I believe it will be enough after delid and if I go with the 9th series I will get a Dark Rock pro 4. The thing is that I don't want my cooler to hide my RGB RAM. So my question is it really worth it to get a 8700k over 9700k? Which is better 2 more cores or 4 more threads? Based on benchmarks they both have the exact same perf when at the same clock speed. I have found a good deal on a PSU so instead of EVGA I plan to order Seasonic Focus plus. 650W should be enough right?

I would go the 8700K route as it performs amazingly well and keeps up with the 9th gen CPU's at gaming.
Moreover it overclocks extremely well and if you plan on delidding which I have done, it is even better. Also delidding was a loit easier than I thought it would be! I dropped 18 degrees C and have it running at 4.9GHz for a 24/7 overclock at 1.278v...5GHz was easy as was 5.1GHz but I do not like vcore over 1.325 for 24/7...yes I am a scaredy cat!!!

Both the 9700K and the 8700K will do a great job on the gaming front but the 8700K might just be better on the streaming front with it's extra threads...either way, you can't go wrong...

I was thinking the same thing! I do want to stream from time to time, but I haven't been able to find benchmarks that put both cpus at test strictly in streaming. More what I have found is that the 8700k tends to have a lower CPU usage when gaming next to the 9700k, which let's me believe that the 8th series will perform better in multitask. What worries me is that in the next 2-3 years games may tend to run better on higher core count processors, which may give the 9700k an edge, but we can only speculate. What cpu cooler are you using? I plan to get arctic freezer 240, cooler master 240 or thermaltake extreme s. For mobo I will go with the Asus Strix z390-F

The 9700K with 8 true cores shows up equivalent in multithreaded benchmarks to the 8700K.
Here is one comparison:
https://www.anandtech.com/show/13400/intel-9th-gen-core-i9-9900k-i7-9700k-i5-9600k-review/8

With the soldered heat spreader, you can expect to overclock to 5.0 easier with the 9700K.
Your need for good cooling will be less.

If the prices are close, go with 9th gen.

Be careful about interpreting task manager utilizations.
Windows spreads out cpu activity across all available threads.
Since the 8700K has 12 threads vs. 8 for the 9700K, your average utilization of the same workload will show less % busy.
It is the slightly better single thread speed of the 9700K which will prevail in gaming.

Lot all that different, you should be happy with either.

 

[horche]

Ok it's me again. I've been waiting patiently for the prices to drop for this black friday. I have ordered the NCIX s340 Elite case in black (70$ deal) but I have been wondering if I should go with the 8700k or 9700k. The price for the 8th gen is 450$ and for the newer one- 500$. So the difference is 50$ I plan to delid the 8700k and based on benches and forum threads I have concluded that the 9700k won't need a delid but it would need a better cpu cooler as it runs hotter (+2cores). If I go for the 8th series I will pair with an AIO 240mm cooler as I believe it will be enough after delid and if I go with the 9th series I will get a Dark Rock pro 4. The thing is that I don't want my cooler to hide my RGB RAM. So my question is it really worth it to get a 8700k over 9700k? Which is better 2 more cores or 4 more threads? Based on benchmarks they both have the exact same perf when at the same clock speed. I have found a good deal on a PSU so instead of EVGA I plan to order Seasonic Focus plus. 650W should be enough right?

I would go the 8700K route as it performs amazingly well and keeps up with the 9th gen CPU's at gaming.
Moreover it overclocks extremely well and if you plan on delidding which I have done, it is even better. Also delidding was a loit easier than I thought it would be! I dropped 18 degrees C and have it running at 4.9GHz for a 24/7 overclock at 1.278v...5GHz was easy as was 5.1GHz but I do not like vcore over 1.325 for 24/7...yes I am a scaredy cat!!!

Both the 9700K and the 8700K will do a great job on the gaming front but the 8700K might just be better on the streaming front with it's extra threads...either way, you can't go wrong...

I was thinking the same thing! I do want to stream from time to time, but I haven't been able to find benchmarks that put both cpus at test strictly in streaming. More what I have found is that the 8700k tends to have a lower CPU usage when gaming next to the 9700k, which let's me believe that the 8th series will perform better in multitask. What worries me is that in the next 2-3 years games may tend to run better on higher core count processors, which may give the 9700k an edge, but we can only speculate. What cpu cooler are you using? I plan to get arctic freezer 240, cooler master 240 or thermaltake extreme s. For mobo I will go with the Asus Strix z390-F

The 9700K with 8 true cores shows up equivalent in multithreaded benchmarks to the 8700K.
Here is one comparison:
https://www.anandtech.com/show/13400/intel-9th-gen-core-i9-9900k-i7-9700k-i5-9600k-review/8

With the soldered heat spreader, you can expect to overclock to 5.0 easier with the 9700K.
Your need for good cooling will be less.

If the prices are close, go with 9th gen.

Be careful about interpreting task manager utilizations.
Windows spreads out cpu activity across all available threads.
Since the 8700K has 12 threads vs. 8 for the 9700K, your average utilization of the same workload will show less % busy.
It is the slightly better single thread speed of the 9700K which will prevail in gaming.

Lot all that different, you should be happy with either.

The difference in singe core and multi core performance is due to the lower clock on the 8700k next to the 9700k. If both OC to let's say 5ghz then they are practically the same in perf. The fact that Windows spreads workload across threads leads me to believe that the 8700k would be better suited for streaming, multi tasking and better in the long run as more cpu intensive games are being brought up, not particularly in gaming.

I am not sure about the cooler and the mobo though. Any suggestions ?

 

[vMax]

On the motherboards, I would go Z390 and for once, Gigabyte seem to have come out on top with a great range of Z390 boards especially for overclocking with a solid VRM and cooling design in a 12+1 Phase VRM...From the Gigabyte Z390 Aorus Pro upwards with the Gigabyte Z390 Master sitting at the top but all six mid to top end motherboards have the 12+1 Phase VRM design...

https://www.youtube.com/watch?v=v5NDtS8za8g

As to cooling, that is a bit trickier...I like AIO's and am currently using the Corsair H150i Pro which is the 360mm AIO and it is great at keeping my 8700K at 4.9GHz very cool and quiet for my 24/7 overclock...Though any decent 280mm AIO or top end air cooling in the Noctua, be quiet Dark Rock Pro 4 range should handle and overclocked 8th or 9th gen CPU..Though if overclocking, go as good as you can...

 

[geofelt]

Yes, the clocks will be similar when overclocked.
If you will delid your 8700K(a $40 charge) you should be able to get near 5.0

Most 9700K will also get near 5.0.

FWIW, I looked up the passmark scores for both:
i7-8700k is 15962 total and single thread 2704
i7-9700K is 17241 total and single thread 2818.
Pretty darn close, you can pick the cheaper of the two.

I think the difference is that the 9700K has 8 true full cores while the i7-8700K uses hyperthreading which shares resources on each of the 6 true cores.

Love the case, it has plenty of airflow for a good cooler.
The DR pro4 cooler you suggested is a very good unit and all you need.

As to motherboards, it is hard to say.
I would favor a Z390 motherboard over Z370 because of the improved voltage regulation.
As to brands, I think ASUS and Asrock seem to have the most active forums for overclocking.

 

[jackstas]

its stupid if you buy an i7 8700K and a z390mo the i9 is just 200 more