Is a Core i7 8700K enough for two-way SLI GTX 1080's

Solution
The 8700K is enough to run twin 1080s in SLI.

The "no bottlenecks" part I think is a stretch because all systems have a bottleneck. The bottleneck is simply the component that's preventing you from having higher performance. If you upgrade your bottleneck, you get better performance. No gaming PC has infinite FPS, therefore every PC has a bottleneck.

Your question cares more, I think, about whether the bottleneck would be the monitor, the GPUs, or the CPU. It could also be something like the RAM or if you're playing multi-player games then your ISP. You'd have to tell us what monitor you plan to use in order to give a sense of whether your proposition is reasonable, overkill, or will not let you use your monitor fully. For...

achilles174

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Sep 30, 2017
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The 8700K is enough to run twin 1080s in SLI.

The "no bottlenecks" part I think is a stretch because all systems have a bottleneck. The bottleneck is simply the component that's preventing you from having higher performance. If you upgrade your bottleneck, you get better performance. No gaming PC has infinite FPS, therefore every PC has a bottleneck.

Your question cares more, I think, about whether the bottleneck would be the monitor, the GPUs, or the CPU. It could also be something like the RAM or if you're playing multi-player games then your ISP. You'd have to tell us what monitor you plan to use in order to give a sense of whether your proposition is reasonable, overkill, or will not let you use your monitor fully. For example, a single 1080p 60Hz monitor - this is overkill (ie, the monitor is the bottleneck), but a setup of four 1080p monitors at 144Hz is the same as 4K @ 144Hz which you won't be able to drive in many AAA games (ie, the CPU or GPU is the bottleneck).
 
Solution


I'm with achilles174 - what monitor are you/do you plan on running? For a 60Hz 1080p or 1440p monitor, it's extreme overkill. However, for one of those ultrawide monitors like 3440x1440p at 60Hz or a 4K 60Hz or a G-sync 1440p monitor, it would make more sense. Unfortunately, the trend of game developers is slowly moving away from good SLI support (or multiple GPU support at all).

By "good SLI support" I mean scaling, or the second GPU offering 75% or higher frame rate improvement over a single GPU. You are essentially throwing away money on the second GPU that is not fully utilized. I sold my SLI GTX 970s earlier this year and made the leap to a single 1080 Ti. Not only does my rig run cooler, but it uses less power. For the first time since the 3dfx Voodoo 2 days of nearly 20 years ago, I no longer recommend nor plan on a new build with multiple GPUs (only old gamers like me remember the name Voodoo :lol:).
 

fordongreeman

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Nov 5, 2017
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Would the x8/x8 PCIe lanes bottleneck the graphics cards?

It's not possible to run two or more graphics cards at full PCIe 3.0 x16 speeds with the Core i7 8xxx/Z370 cihpset unless you buy the extreme edition "x" series Core i7's and LGA 2066 v3 socket motherboard.