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- Be wary that open-air GPUs (like nVidia RTX reference design) add a lot of heat into the case. For CPU & Board temperatures, it's best to use the blower-style GPUs that dump the heat straight out of the case through back shroud. You can still use open-air GPUs, but then you need to consider opening the top of the case, which is usually rather noisy solution.
Heh, I've got two 2080tis plugged in directly to the motherboard and while they don't mind having 2 slots between them the CPU above can peak 5-10 degrees hotter than it normally would when everything in the system is doing rendering (CPU + GPU). On average though I think its a difference of a couple degrees but when denoising in Corona hits it then all bets are off, I had peak temps go from 67 to 74 degrees.
Those are peaks though so usually its a bit less of a difference.
Thats in a Fractal Design XL R2 with two fans on top, 1 at the front and 1 at the back.
For reference, the hottest GPU peaks at 67 degrees although granted, I have both limited to 70% TDP (180W per GPU). They are your regular aftermarket GPUs so not the blower types. The CPU is a dual 2696v3 so not exactly a chill chip either.
I suspect there is potential for better airflow and I'd also profit a bit by moving the top most GPU down a PCI-E slot as its very close to the Noctua D14 coolers. All in all, I think when everything is on peak load things just get hot in there.
Oh and I did have a 2080ti blower as well and I think the temps were even more under control then :)