I've upgraded to the Gekkoscience 8 Port USB Hub 2.0 (using 12V 10A 120W DC Power Supply) from my original Bitcoin Merch 7-Port USB Hub and now all three COMPAC F sticks are running at 400mhz no problem. Each stick is being cooled by it's own Noctua NF-A4x10 FLX fan.

My issue is that one of the three sticks (the problematic one from the beginning) is running much hotter than the other two. It would burn my finger if I left it on there for too long. I'm trying to figure out why this one is running so much hotter and what temperature is acceptable/safe.

On the USB tester, all sticks are pulling around 5.07V, 1.71A, and 8.7W. My infrared thermometer can't pull the temp, so I used a meat thermometer that read 102F for two sticks and 120F for the other. That doesn't seem too accurate, but I'm not sure how else to get the temp.

Only thing I can think of is I had previously turned the voltage screw quite a bit in the past, but wouldn't I see voltage use different between them if that's what was causing the heat?

Anyways, just looking for some advice so I don't burn up the chip and/or house.

TIA