Post AXGLNjOFg9QMrvBHuK by mansr@society.oftrolls.com
(DIR) More posts by mansr@society.oftrolls.com
(DIR) Post #AXGLNiTX523Q20dzV2 by ssb@infosec.exchange
2023-07-01T20:42:53Z
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I need to look into re-learning #thermodynamics. #Motherboard says the #CPU #core #temps are around 10C higher than what the #heatsinks are (I built my own #sensor set for this machine - because I wanted to.)Granted, this is one of the old E5-2600v2 series #motherboards in the computer I'm typing on right now.. (different computer, not the server - waiting for #Amazon to deliver my new #frelling CPU coolers), an X9DRH-7TF by SuperMicro, so maybe that's #normal?Yeah, I know, WAY overkill for a #workstation, but it's also a #pull from a previous #server iteration, so...Yes, I'm #weird. I upgrade my #servers, then my #workstations get all the old #parts.
(DIR) Post #AXGLNjOFg9QMrvBHuK by mansr@society.oftrolls.com
2023-07-01T21:17:01Z
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@ssb The CPU-internal sensor reports the junction temperature, commonly referred to as Tj in datasheets. A typical limit for Tj is 105 °C. The outer package temperature will always be lower, the difference depending on the die to surface thermal resistance (measured in °C/W). 10 °C sounds perfectly reasonable to me.
(DIR) Post #AXGLOW7GW5x3zQbujY by mansr@society.oftrolls.com
2023-07-01T21:17:07Z
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@ssb The job of the cooler is to transport heat from the package surface to the surrounding air at the same rate it is produced by the chip. For simplicity, CPU spec sheets quote the thermal design power (TDP) which must be met by the cooler. Heat flows from hot to cold, so the CPU die will always be the warmest and the ambient air the coldest.
(DIR) Post #AXGLRvMT70U99gLXE0 by mansr@society.oftrolls.com
2023-07-01T21:17:48Z
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@ssb And this is why thermodynamics is an important part of an electronic engineering degree.