Thanks for the feedback Denis! Yeah, I could definitely see a high-power GPU like that causing trouble. Granted, I really like how quiet it is most of the time, but when I've got a 100% load on the CPU I expect it to jump up a smidge. Has anyone else seen this kind of behavior? The fan speed should be controlled by the board, and though this higher-watt Xeon can technically handle warmer temps, it's a little silly that it would get that warm (and climbing) without the fan speed climbing past the lowest setting. So I get to googling, as one does, and find that there are half-dozen or so threads on the HP forums complaining about the same thing, and that eventually people give up and just modify the idle fan speed in BIOS to run faster 24/7, since it doesn't seem to get any faster. Lo and behold, the CPU got up to 80c before I cut the cord, and at no point did the CPU fan ramp up past ~600rpm. Thinking that maybe there was some Linuxy thing that was screwing with the board's ability to read the CPU temp (dumb, but I'm grasping at straws) I booted into Windows to run some stress tests. I've got an HP Z420 workstation that I've been playing around with, and noticed that when I was screwing around in a pretty CPU-intensive process on Linux that the fan speed never ramped up, but the heatsink got pretty toasty.
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