My SSD is in the second pci-e (3.0) slot, under the video card. The controller heats up to 60 degrees, at the slightest load. Plus, if you load the video card, and I have a gtx 1080, then from 42 (according to the controller) it rises to 58-60. Not critical, of course, but I would like a little less temperature. And that's without a radiator.
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