A single RTX 2080 or two GTX 1080 TI in SLI?

Cyber_Akuma

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Oct 5, 2002
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Right now, I have a system that is starting to show it's age a bit... though still works fine for the vast majority of games (especially if I don't attempt to max out the settings on the newer ones).

I built it late 2012/early 2013, and it's a i7 3770k (sadly stock clocks as the overclock failed) with two GTX 670s with a very minimal overclock in SLI. The CPU while slightly showing it's age is still more than enough for just about every game out there, the GPUs though are showing their age far more. Thanks to the whole cryptocurrency nonsense newer GPUs were out of my price range for a while.... plus I wanted to wait until a single GPU was powerful enough to outperform both my GPUs combined, since usually I try to buy one top-end GPU and then later add another cheap for SLI when they are older and cheaper to boost performance... rinse and repeat for when the next single card can outperform a SLI setup.

Anyway, I might have to put a stop to that now. I mean, I am impressed with the RTX cards, and while I understand what a giant deal it is to do real-time raytracing.... similar to PhysX and 3D Vision and all those other technologies I doubt it will be adapted outside of a handful of games for a while, likely not until at least one or two more generations of cards.

I was reading that the RTX 2080 has a 35% performance increase over the 1080, which honestly is impressive.... but I noticed that used GTX 1080 TI cards are going for $400-500. Considering I could buy two GTX 1080 cards for less than a single RTX 2080 (assuming they don't go the same overpriced route as 1080s did when they were current thanks to cryptomining) would it just be a better idea to go that route?

First of all, yes, I realize that not every game supports SLI, but from my understanding about 70-80%, if not more, do. And the ones that don't will still work as a single card.

I also realize that I will not have the whole raytracing feature using GTX cards instead of RTX (and honestly, as much as I don't think it will take off for a while.... I do still want that feature and am not sure if I should stick with a GTX because of that).

And finally, due to having many other cards in my system, I pretty much NEED to get the "blower" style cards that have a single fan at the end, since a card with a fan at the beginning or middle would be blocked by the other cards below it. This severely limits my choices as most cards are a multi-can setup, and even among the blowers most of them have a separate radiator which I don't have room to mount (so I would need to get cards that ONLY have a single fan at the end and nothing else), I am not even sure if the RTX 2080 would be available in that format. I also generally tend to prefer EVGA cards, I know they had a blower style like that for the GTX 1080 Ti, not so sure if they will do that for the RTX cards.

Oh, and one more thing, I doubt it but I figured it might be good to ask anyway. Would my older CPU be a bottleneck for those cards?
 
Solution


Use Tridef 3D

play all directx games in 3D, <---select a generic profile for all directx games

https://www.youtube.com/watch?v=nh1Ggh5aSSA&t=144s

the latest version of Tridef 3D 7.4 enables SLI in directx games, get the sli system and use Tridef 3D on non sli enabled games.:sarcastic:
So, assuming it's for gaming and you don't do a lot of video editing etc. Then a single 1080 Ti is probably more than enough, it would be a huge jump over 670 SLI.

What resolution and refresh rate is your monitor, or what might you upgrade to? For 1080p 60HZ, even a single 1080 Ti is complete overkill, but for 1080p 144Hz or 1440p, then it's about right. I really don't see any need for 1080 Ti in SLI unless you're playing in 4K.
 
It is for gaming, my monitor is 1080p but refreshes up to 144hz, I would like to at least hit 120FPS since I have a 3D setup so I would like to be able to use the 3D at 60FPS at times.

I know that some recent games like FFXV and Monster Hunter World push a single 1080 Ti even at 1080p, and they have SLI support... I know that FFXV for sure supports SLI at last.
 
I don't know if your CPU is good enough to maintain at least 120fps. It's one of those ironic things, a weaker CPU is better at 4K 60Hz than it is for 1080p 144Hz. In order for the GPU to render enough frames, both it and the CPU need to keep up with each other, I honestly don't think using 2 1080 Ti cards in SLI would give much improvement over a single card.
 
A single gtx 1080 Ti has same performance as a rtx 2080, i honestly would go with 1080 ti (single or SLI depends on you and your money). Eventually if you go for sli you can upgrade later the entire platform, i say this because right now gtx 1080 ti are rally cheap and it will be a shame to miss this opportunity.
 
It would be better off for your to buy a highly-binned GTX 1080 Ti, or a Titan Xp, then adding a custom GPU waterloop to it for OC. The RTX 2080 is marginally better than the GTX 1080 yet more expensive than the 1080 Ti. NVidia has outdone itself, and the 10-series are certainly build-worthy.

I hope this post does not get deleted though 😀
 
If you do a search, this question has been asked since the launch almost..

I was finishing my build just before the new card announcement, I went with 2 1080Tis, Yes the new architecture will be awesome I am sure, but by the time it becomes mainstream with game developers, the 2080/ti cards will be obsolete so I went with 2 strong cards and when all my current programs "need" ray tracing, I will then grab the newest card or one generation back that will also have been capable for a while by then.
 


Use Tridef 3D

play all directx games in 3D, <---select a generic profile for all directx games

https://www.youtube.com/watch?v=nh1Ggh5aSSA&t=144s

the latest version of Tridef 3D 7.4 enables SLI in directx games, get the sli system and use Tridef 3D on non sli enabled games.:sarcastic:
 
Solution


Keep in Mind that when gaming at 1080p,
the CPU carries most of the load NOT the GPU. so your CPU and OC if any will have more affect than your GPU at 1080P and SLI at 1080p is useless until you go 1440 or above.