I am in the middle of a build and was intrigued by your use of both open air and blower style cards for SLI.
I have a question about this if possible.
Unlike your builds I am limited to using air coolers for CPU (D15s) but I have otherwise a big tower case which should allow for good airflow (Enthoo Primo). In my case would you advice on getting two blower style cards (I am looking at 1070s) or one of each like you did with your build?
I say this because whereas your cpu is water-cooled, mine would be air cooled so the open air card may raise the temps (?). I will be overclocking my cpu (5960x) to 4ghz if possible.
Welcome to the TBG Forum, TomBor77!
Yes, indeed, many readers are interested in that particular mixed setup. I've done it with previous guides (including the 980 Ti 4K Challenge
and the 780 Ti Cooler Comparison
), and I'm always happy with the results. What you end up with is the two cards nearly in sync with regard to temperatures, as the blower style model on the bottom naturally runs hotter on its own, while the open-air model on top is forced to higher temperatures due to the dual-card configuration. You can't get ultra-low temperatures when running in SLI, that's just not going to happen, so balanced temperatures is much better for equalizing clockrates.
All that being said, I just got a second open-air GTX 1080 in for testing, and next week I'll begin running 4K benchmarks in SLI to see how two open-air cards do. I suspect I'll have a lot of work to do to keep the top one from running at lower clocks.
And then there's the issue of CPU cooling. Liquid cooling is essentially unaffected by GPU waste heat, but a tower CPU cooler like the D15s most certainly is. In fact, I've found the D15s actually loses a lot of performance when inundated by waste heat, underperforming thinner coolers that let hot air past them and up to the top of the case. Is there a reason you have to use the D15s? For SLI I really prefer liquid cooling the CPU. I just pulled my 1070 SLI system out of my NH-U14S-equipped 6700K test rig because it was becoming a hot box.
If you need to keep the D15s, I do think you'll be better off with a combination of a blower-style and open-air cooler on your video cards. That will cut waste heat hitting your CPU nearly in half. You could go with two blower-style cards, but in the end, they will not perform better than a combo setup, and will be louder. The only advantage will be slightly lower CPU temps, but the D15s is more than capable of handling the waste heat of one video card.