What CPUs will handle two 1080 Ti s in SLI?

lumiii · Jan 16, 2018

I will hooking up two GTX 1080 Ti's to a custom water cooling loop. After doing some research I found out that if games are CPU bound then the frame times will be horrible. So, I was wondering what CPU is powerful enough to make the game GPU bound at 2560 x 1440 @ 165Hz. I have thought about:

i7-8700k @ 5.3 GHz
i7-7820X @ 4.9 GHz
i9-7900X @ 4.5 GHz

This is for gaming. More cores, Higher clocks, or a mixture of both?

vapour · Jan 16, 2018

I7-8700k in 4k gaming, games can not effectively use more than 4 cores yet and 8700k has best single core atm. However, it largely depends on game, some games do not support SLI well and you may see only 10% boost over single 1080 ti

lumiii · Jan 16, 2018

Is the 8700k still the best at 1440p? If the CPU is still the bottle-necking problem will applying extra AA or DSR from Nvidia help fix the issue?

Karadjgne · Jan 16, 2018

A stock i7-7700k can handle that workload. Frames is all about the cpu, resolution is all gpu. So it's the 165fps that's going to be the deciding factor, not the 2560x1440.

Out of those 3, the 8700k will be the strongest, generally, as most games won't use the full amount of cores available on the other 2 cpus and has higher clocks.

A 2-way sli won't soak up the bandwidth of pcie 3.0 at x8/x8, so the extra pcie lanes afforded by the other cpus won't make much if any difference. If you were running 3x or 4x cards, then yes, but not 2x.

PCMAN · Feb 27, 2018

newer 4 core or any 6 core
I'm on 6850k 3.6@4.4
X99 Asus strix
32gb DDR4 pc 3000
2 1080GTX SC @ 2.1/5508X2 MEM
SSD 2 × 480GB + SATA 6GB + Raid 0 16gb ram cache
51 games 30+ SLi 2014-2017 games
I'm at 1080p right monitor

Btw 2 1080gtx 120-144fps max game NVCP cap to 144hz unless boost 165hz

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What CPUs will handle two 1080 Ti s in SLI?

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