Best Voltage for my i7 8700k

[RhinoTV]

So its my first ever time overclocking and dont really know what im doing. I have it at 4.8ghz but I noticed that when im rendering a video ( most stressful thing I do) it gets to a max of 89c ( Thats the highest i've seen it). Even in some games like fortnite it can go to 80c for a second and then to around 60-70c. I have a corsair h115i pro cooler but i still think my temps are really high ... Someone was saying that if i lower the voltage ill get lower temps.

Heres what i see now https://imgur.com/a/S6Vgvij

 

[Rodrigodrt]

1.3V isn't too bad, but things gets exponentially hot after 1.25v, with a H110i GT i get upper 70's in stress testing, 68~70C tops while gaming and that with only 1.24v... all in all i think thats what you get for 1.3V, thought it really depends on your ambient temp, how well seated is your cooler unit, your case arrangement and ventilation, how good and how properly applied is your thermal compound.

I could get a 5C reduction by only swapping my thermal compound from artict silver 5 to a noctua NT-h1

And yes the lower your Vcore, the less heat you get, try to lower it a little and see if it remains stable... while i said 1.3v is fine, i would never go over about 1.27 ish or let my CPU go over 77C on load, unless for stress testing, wich is fine since its just for a period of time.

 

[RhinoTV]

What voltage should i try do ?? Also im on a asus board so if you can it would be great to know what to change

1.3V isn't too bad, but things gets exponentially hot after 1.25v, with a H110i GT i get upper 70's in stress testing, 68~70C tops while gaming and that with only 1.24v... all in all i think thats what you get for 1.3V, thought it really depends on your ambient temp, how well seated is your cooler unit, your case arrangement and ventilation, how good and how properly applied is your thermal compound.

I could get a 5C reduction by only swapping my thermal compound from artict silver 5 to a noctua NT-h1

And yes the lower your Vcore, the less heat you get, try to lower it a little and see if it remains stable... while i said 1.3v is fine, i would never go over about 1.27 ish or let my CPU go over 77C on load, unless for stress testing, wich is fine since its just for a period of time.

 

[Rodrigodrt]

Sorry, I don't know what an ASUS board bios looks like, but I think what you should do here is to reset your bios, then try to find a bios settings that manages your cpu voltage, it will probaby be set to "auto" by default, and it should probably be called something like CPU VCORE or just VCORE, dont mistake it with VCCIN our cpu input voltage.

Anyways, I'd set it to 1.25v, then go for temperature tests, if the temp is fine, start raising the multiplier by increments of one, notice on CPU z how your bus speed is 100 (rounded), and your multiplier 48, meaning 48x100=4800mhz=4.8ghz, your default multiplier should be 37, keep raising it to 38,39,40,41 and stress test each one for a couple of minutes, once you reach a multiplier value that crashes on stress test, then thats the limit for 1.25v, sorry but this is just a very very basic overclocking step, you need to read some guides about it.

 

[RhinoTV]

Would u happen to know any video i can follow?? I tried doing the voltage you said with the settings i already have but wouldn't boot so i reset it to default.

Sorry, I don't know what an ASUS board bios looks like, but I think what you should do here is to reset your bios, then try to find a bios settings that manages your cpu voltage, it will probaby be set to "auto" by default, and it should probably be called something like CPU VCORE or just VCORE, dont mistake it with VCCIN our cpu input voltage.

Anyways, I'd set it to 1.25v, then go for temperature tests, if the temp is fine, start raising the multiplier by increments of one, notice on CPU z how your bus speed is 100 (rounded), and your multiplier 48, meaning 48x100=4800mhz=4.8ghz, your default multiplier should be 37, keep raising it to 38,39,40,41 and stress test each one for a couple of minutes, once you reach a multiplier value that crashes on stress test, then thats the limit for 1.25v, sorry but this is just a very very basic overclocking step, you need to read some guides about it.

 

[Rodrigodrt]

Would u happen to know any video i can follow?? I tried doing the voltage you said with the settings i already have but wouldn't boot so i reset it to default.

Sorry, I don't know what an ASUS board bios looks like, but I think what you should do here is to reset your bios, then try to find a bios settings that manages your cpu voltage, it will probaby be set to "auto" by default, and it should probably be called something like CPU VCORE or just VCORE, dont mistake it with VCCIN our cpu input voltage.

Anyways, I'd set it to 1.25v, then go for temperature tests, if the temp is fine, start raising the multiplier by increments of one, notice on CPU z how your bus speed is 100 (rounded), and your multiplier 48, meaning 48x100=4800mhz=4.8ghz, your default multiplier should be 37, keep raising it to 38,39,40,41 and stress test each one for a couple of minutes, once you reach a multiplier value that crashes on stress test, then thats the limit for 1.25v, sorry but this is just a very very basic overclocking step, you need to read some guides about it.

But you didnt followed my instructions, it was unlikely to score 4.8ghz with 1.25v right off the bat, you have to work your way up until you find out whats the max frequency you can get from that voltage, and then build your way up to your desired relation between temps x ghz x voltage. Notice that the main problem is that there's no sure recipe, some chips can reach, say, 4.8ghz with 1.3v like yours, others maybe not even reach 4.6ghz with 1.3v, requiring even more voltage.

try this:
https://www.tweaktown.com/guides/8481/coffee-lake-overclocking-guide/index2.html

sry but the 8th gen isnt my field of expertize, but here's what you can try instead, since you can run 4.8 @ 1.3v, then reduce it to 1.290V, test, reduce again to 1.280V test, until it fails to boot or becomes unstable, thats how you might find your minimum VCORE for 4.8ghz, wich will result in lower temps.

 

[vMax]

Hi, I think a couple of things come to mind as I have pretty much the same setup. at 4.8GHz I used 1.278v max on adaptive/offset mode and my temps before delidding were for gaming around mid 50's and for Cinebench mid 70's degrees.

I think you should look at reseating your AIO as it might not be on perfectly as I would except better temps than you are getting. The Corsair H115i Pro is fairly good. Secondly you can lower the vcore for the 4.8GHz all core overclock to under 1.3v unless you are very unlucky...I have a Gigabyte motherboard and do not know which ASUS motherboard you have but there are a lot of good articles on overclocking the 8700K on ASUS motherboards and youtube should have some.

It would be interesting to know what your idle temps are as that is also a good indicator of whether the AIO is on properly. Very low 30's degrees C (28 to 32c) is what you should be getting...

 

[RhinoTV]

Definitely not getting that low of temps idle. For some reason with my temps they constantly change. As it could be 50 c then jump to 70 and back down to 60 but it keeps changing

Hi, I think a couple of things come to mind as I have pretty much the same setup. at 4.8GHz I used 1.278v max on adaptive/offset mode and my temps before delidding were for gaming around mid 50's and for Cinebench mid 70's degrees.

I think you should look at reseating your AIO as it might not be on perfectly as I would except better temps than you are getting. The Corsair H115i Pro is fairly good. Secondly you can lower the vcore for the 4.8GHz all core overclock to under 1.3v unless you are very unlucky...I have a Gigabyte motherboard and do not know which ASUS motherboard you have but there are a lot of good articles on overclocking the 8700K on ASUS motherboards and youtube should have some.

It would be interesting to know what your idle temps are as that is also a good indicator of whether the AIO is on properly. Very low 30's degrees C (28 to 32c) is what you should be getting...

 

[Rodrigodrt]

Definitely not getting that low of temps idle. For some reason with my temps they constantly change. As it could be 50 c then jump to 70 and back down to 60 but it keeps changing

Hi, I think a couple of things come to mind as I have pretty much the same setup. at 4.8GHz I used 1.278v max on adaptive/offset mode and my temps before delidding were for gaming around mid 50's and for Cinebench mid 70's degrees.

I think you should look at reseating your AIO as it might not be on perfectly as I would except better temps than you are getting. The Corsair H115i Pro is fairly good. Secondly you can lower the vcore for the 4.8GHz all core overclock to under 1.3v unless you are very unlucky...I have a Gigabyte motherboard and do not know which ASUS motherboard you have but there are a lot of good articles on overclocking the 8700K on ASUS motherboards and youtube should have some.

It would be interesting to know what your idle temps are as that is also a good indicator of whether the AIO is on properly. Very low 30's degrees C (28 to 32c) is what you should be getting...

If thats on idle, you've got a problem with your WC seating, there was some guy not long ago with a problem very much like yours except that his block didnt touched the cpu heatsink AT ALL, thats not your cause or you would have a PC shutdown the moment you start rendering. Regardless, check your pump RPM in corsair link, are you sure you get those temps on idle? check the coolant temperature in corsair link as well.

 

[RhinoTV]

This is what Icue says. You can see the temps are completely messed up no matter what im doing. The real temps are the one in the corner. Keep in mind i am mid game of rainbow six seige Im also 99% sure I have it on right because i had many problems with nzxt x62 cooler with seating it and getting really bad temps. The first temp is my gpu and second is cpu but as i said it changes a lot

Definitely not getting that low of temps idle. For some reason with my temps they constantly change. As it could be 50 c then jump to 70 and back down to 60 but it keeps changing

Hi, I think a couple of things come to mind as I have pretty much the same setup. at 4.8GHz I used 1.278v max on adaptive/offset mode and my temps before delidding were for gaming around mid 50's and for Cinebench mid 70's degrees.

I think you should look at reseating your AIO as it might not be on perfectly as I would except better temps than you are getting. The Corsair H115i Pro is fairly good. Secondly you can lower the vcore for the 4.8GHz all core overclock to under 1.3v unless you are very unlucky...I have a Gigabyte motherboard and do not know which ASUS motherboard you have but there are a lot of good articles on overclocking the 8700K on ASUS motherboards and youtube should have some.

It would be interesting to know what your idle temps are as that is also a good indicator of whether the AIO is on properly. Very low 30's degrees C (28 to 32c) is what you should be getting...

If thats on idle, you've got a problem with your WC seating, there was some guy not long ago with a problem very much like yours except that his block didnt touched the cpu heatsink AT ALL, thats not your cause or you would have a PC shutdown the moment you start rendering. Regardless, check your pump RPM in corsair link, are you sure you get those temps on idle? check the coolant temperature in corsair link as well.

 

[Rodrigodrt]

Idle temps are actually measured with your computer idle lol... not with rainbow six running,

get HWMonitor here:
https://www.cpuid.com/softwares/hwmonitor.html

get the zip, you wont have to install anything, it will tell your temps on each core and package wich is the whole. Just boot up windows and open HWMonitor and let it read your temps for a minute without you doing anything else, it will show the min max and average, get us a screenshot and we might help you better.

 

[vMax]

If your idle temps...that's with nothing running...are above 40 degrees C, then I would re install your AIO as that will probably be the source of your heat...As Rodrigodert has said, HWMonitor will do it but something as simple as Realtemp or CoreTemp will also show you your temps.

 

[RhinoTV]

Reinstalled the AIO and these are temps on idle ( left for like 10-15 mins) https://imgur.com/a/lpy3H2H . This isnt overclocked either. Im thinking its just me or something. Would a good air cooler be okay for a over clock ?? Just i've had problems with temps on 3 AIO coolers now ...

If your idle temps...that's with nothing running...are above 40 degrees C, then I would re install your AIO as that will probably be the source of your heat...As Rodrigodert has said, HWMonitor will do it but something as simple as Realtemp or CoreTemp will also show you your temps.

 

[Rodrigodrt]

Reinstalled the AIO and these are temps on idle ( left for like 10-15 mins) https://imgur.com/a/lpy3H2H . This isnt overclocked either. Im thinking its just me or something. Would a good air cooler be okay for a over clock ?? Just i've had problems with temps on 3 AIO coolers now ...

If your idle temps...that's with nothing running...are above 40 degrees C, then I would re install your AIO as that will probably be the source of your heat...As Rodrigodert has said, HWMonitor will do it but something as simple as Realtemp or CoreTemp will also show you your temps.

Alright, so what i can make out of this is that your idle temps are averaging 32-34C, notice the min/max values, max values are represented when your cpu is on load, notice how your cpu usage ranged from 60 - 90% across some cores/threads at a point, however when you took the Picture it was using about 1-5% and was Reading about 34C, thats your idle temp, wich frankly seems fine to me since:

Your max vcore was 1.264V since there's fluctuations i assume you Vcore is set to 1.25v on bios, at 1.25v things get hot, at 1.30V things gets even hotter.

Now to the point, turbo boost or OC genie? they are knowing for extrapolating the values you really need, and they aren't just 'boosts' they are actual overclocks, and you should Always do it manually.

get some rendering/stress test going and leave HWmonitor open, it will tell your max/min temps and voltage changes. Also, to what regards your last questions, there are good air cooling solutions, like noctua NH-D14 / NH-D14 / Hyper 212 Evo and etc, but the best air coolers are going to match the performances of AIO WC's at best with a much louder noise.

 

[RhinoTV]

Rendered out a video in 4k and the max temps it got was 75c which is a lot better. Again this is just on the default mode in the bios. Only thing i changed is having the xmp everything else ( like the voltage) is on auto

Reinstalled the AIO and these are temps on idle ( left for like 10-15 mins) https://imgur.com/a/lpy3H2H . This isnt overclocked either. Im thinking its just me or something. Would a good air cooler be okay for a over clock ?? Just i've had problems with temps on 3 AIO coolers now ...

If your idle temps...that's with nothing running...are above 40 degrees C, then I would re install your AIO as that will probably be the source of your heat...As Rodrigodert has said, HWMonitor will do it but something as simple as Realtemp or CoreTemp will also show you your temps.

Alright, so what i can make out of this is that your idle temps are averaging 32-34C, notice the min/max values, max values are represented when your cpu is on load, notice how your cpu usage ranged from 60 - 90% across some cores/threads at a point, however when you took the Picture it was using about 1-5% and was Reading about 34C, thats your idle temp, wich frankly seems fine to me since:

Your max vcore was 1.264V since there's fluctuations i assume you Vcore is set to 1.25v on bios, at 1.25v things get hot, at 1.30V things gets even hotter.

Now to the point, turbo boost or OC genie? they are knowing for extrapolating the values you really need, and they aren't just 'boosts' they are actual overclocks, and you should Always do it manually.

get some rendering/stress test going and leave HWmonitor open, it will tell your max/min temps and voltage changes. Also, to what regards your last questions, there are good air cooling solutions, like noctua NH-D14 / NH-D14 / Hyper 212 Evo and etc, but the best air coolers are going to match the performances of AIO WC's at best with a much louder noise.

 

[Rodrigodrt]

I find it strange that you get 1.264V on default settings, but again i'm not expert on the 8700k models. Can you confirm that your max Vcore on HWmonitor is 1.264v WHILE doint stress tes/renderingt? also, whats your current Ghz?

 

[RhinoTV]

Heres a screenshot of when im rendering that video https://imgur.com/a/F9PDRGg

I find it strange that you get 1.264V on default settings, but again i'm not expert on the 8700k models. Can you confirm that your max Vcore on HWmonitor is 1.264v WHILE doint stress tes/renderingt? also, whats your current Ghz?

 

[Rodrigodrt]

Heres a screenshot of when im rendering that video https://imgur.com/a/F9PDRGg

I find it strange that you get 1.264V on default settings, but again i'm not expert on the 8700k models. Can you confirm that your max Vcore on HWmonitor is 1.264v WHILE doint stress tes/renderingt? also, whats your current Ghz?

Ok, so here's my conclusion with whats going on: Everything is fine. Your CPU has turbo boost on by default wich is what making it range from 800Mhz to 4.7ghz when the 8700k default clock is 3.7ghz, turbo boost is basically an automatic overclock, its also making your voltage jump up to 1.264V , again, that rule, anything over 1.25V gets HOT.

75C average while rending wich is pushing your cpu usage to 98-100%, at that Ghz, at that voltage makes that temp expected and it isnt bad tbh, but if you're conservative you may want to be around 70 to be Golden, i suspect that right now you'll get 70ish to 70's low while gaming wich is not bad but under 70C is gold.

I noticed that your cooler pump is adjusting itself from 1000RPM to 2000RPM, while the performance mode rpm for your pump is actually 2900RPM and quiet mode is 1000RPM, nedless to say the faster it goes the cooler it gets, change your H115 to performance mode.


I can't help much at this point other than to say, get your CPU configured manually, Vcore voltage set to override and manually set, clock speed manually input, pump RPM manually set to it's best performance, if needed get a good thermal compound, odds are that if you can get to 4.7ghz with 1.264V on auto mode, you can get it lower by adjusting manually, that way you'll probably manage to get lower temps, your current temps wont destroy your cpu at all but getting lower temps would be better for obvious reasons.


lastly, 85C on prime is correct, prime turns your cpu into a grill, its an unrealistic load designed to test your stability, nothing else that you do will match prime's temps.

 

[RhinoTV]

So what should I try get my voltage to? I can change The 'CPU Core Voltage Override' & 'Dram voltage'. Am I supposed to change the CPU Core Voltage Override to what 1.27/1.28?? Ive tried doing this but my pc just shuts off and boots up like 2 mins later in safe mode.

Heres a screenshot of when im rendering that video https://imgur.com/a/F9PDRGg

I find it strange that you get 1.264V on default settings, but again i'm not expert on the 8700k models. Can you confirm that your max Vcore on HWmonitor is 1.264v WHILE doint stress tes/renderingt? also, whats your current Ghz?

Ok, so here's my conclusion with whats going on: Everything is fine. Your CPU has turbo boost on by default wich is what making it range from 800Mhz to 4.7ghz when the 8700k default clock is 3.7ghz, turbo boost is basically an automatic overclock, its also making your voltage jump up to 1.264V , again, that rule, anything over 1.25V gets HOT.

75C average while rending wich is pushing your cpu usage to 98-100%, at that Ghz, at that voltage makes that temp expected and it isnt bad tbh, but if you're conservative you may want to be around 70 to be Golden, i suspect that right now you'll get 70ish to 70's low while gaming wich is not bad but under 70C is gold.

I noticed that your cooler pump is adjusting itself from 1000RPM to 2000RPM, while the performance mode rpm for your pump is actually 2900RPM and quiet mode is 1000RPM, nedless to say the faster it goes the cooler it gets, change your H115 to performance mode.


I can't help much at this point other than to say, get your CPU configured manually, Vcore voltage set to override and manually set, clock speed manually input, pump RPM manually set to it's best performance, if needed get a good thermal compound, odds are that if you can get to 4.7ghz with 1.264V on auto mode, you can get it lower by adjusting manually, that way you'll probably manage to get lower temps, your current temps wont destroy your cpu at all but getting lower temps would be better for obvious reasons.


lastly, 85C on prime is correct, prime turns your cpu into a grill, its an unrealistic load designed to test your stability, nothing else that you do will match prime's temps.

 

[Rodrigodrt]

Thats the problem, there's no telling what voltage is the best for you because each chip handles voltages differently, what I would if i were you, would be to set it to 1.25v running at 4.2ghz for safety, check if your temps are alright, then start increasing your clock to 4.3ghz 4.4/4.5 until you find your max clock until your system fails to load, this is when you decide if you have more room for more voltage and then more clock wich leads for more heat or if you're at the best heat x performance spot.

it didn't boot before because for your chip, 1.25v is not enough for 4.8ghz, someone said here if im not wrong that they used 1.278v for 4.8ghz, remember you were at 1.3V for 4.8ghz, every chip is different, some needs more some needs less.

Dram voltage must be in accordance to your ram specs,wich you must know, some uses 1.5v, some 1.65 it depends on what you have.

just an example here, I'm using a 4770k, I run a 4.4ghz at 1.24V and i get 78C on stress testing and 68 while gaming using an H110i GT, to get to 4.5ghz I needed 1.27V, my temps rose to 84C on stress and 75 ish on gaming, while this is still fine, I'm conservative so the 100mhz tradeoff wasn't Worth it for me. So keep that in mind.

 

[RhinoTV]

Thanks so much for that. You really cleared things up for me. Appreciate it a lot

Thats the problem, there's no telling what voltage is the best for you because each chip handles voltages differently, what I would if i were you, would be to set it to 1.25v running at 4.2ghz for safety, check if your temps are alright, then start increasing your clock to 4.3ghz 4.4/4.5 until you find your max clock until your system fails to load, this is when you decide if you have more room for more voltage and then more clock wich leads for more heat or if you're at the best heat x performance spot.

it didn't boot before because for your chip, 1.25v is not enough for 4.8ghz, someone said here if im not wrong that they used 1.278v for 4.8ghz, remember you were at 1.3V for 4.8ghz, every chip is different, some needs more some needs less.

Dram voltage must be in accordance to your ram specs,wich you must know, some uses 1.5v, some 1.65 it depends on what you have.

just an example here, I'm using a 4770k, I run a 4.4ghz at 1.24V and i get 78C on stress testing and 68 while gaming using an H110i GT, to get to 4.5ghz I needed 1.27V, my temps rose to 84C on stress and 75 ish on gaming, while this is still fine, I'm conservative so the 100mhz tradeoff wasn't Worth it for me. So keep that in mind.