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The physics of CPU cooling

D

Deadjasper

2[H]4U
Joined
Oct 28, 2001
Messages
2,718
I'm using a Shuttle DH370 as my Blue Iris server and have been trying to cool it down a bit before the heat of the summer hits and can't seem to make any progress at all. So far I've run it with the top off, no difference. I've mounted 2 1U server fans blowing both in and out and they just made it run hotter. Currently, with no extra cooling at all it's running between 50 and 55c with occasional spikes to the low 70s. I suspect that when summer arrives in full I'll be facing a real cooling problem. The 2 server fans move a helluva lot more air than the 2 oem fans on the heatsink so I don't understand why they make the CPU run hotter whether they blow in or out. At this point I suspect the problem is the oem heatsink itself. It's solid aluminum and a bit on the thin side. Anyone have any ideas.
 
could lower the cpu speed and voltage a bit. got fans on it like this?

1745244205514.png
 
Diminishing returns. Cooling basically is a transfer of energy to a lower state. The bigger the difference the more that can transfer. Like trying to cool a 70C cpu with 60C air versus 25C air.

Also if your flow of air is extremely turbulent you can create pockets of warm air inside the case that cause cooling problems. Think of tiny whirlpools at the edges of some rivers.

Air pressure can cause issues too if you have your inlet and outlet too far out of balance.

It can be a deep rabbit hole that sometimes trial and error is the best means to improve.
 
Probably the OE sink, maybe the tim is bad too. 70 really isn't terrible if it's a powerful CPU -- That's a very small system, it'll be difficult to cool the CPU no matter what you put on it.
 
CPU is a i7 8700. There may be enough room to install a regular heatsink/fan in it leaving the top off of course. Gonna explore that next.
And yea, being a tiny PC limits the options.
 
below 95 should not be a big issue for an intel cpu like that (they run for years in office around the world in much worst setup than that), if it run at 50-55 which is quite good, if your room temp is 6-8 celcius higher during the summer you should still quite ok ?

Aluminium and thin is not ideal but looking at picture it seem like it has a nice amount of surface to its design and if fast u2 fan does not help, the choice-design of the oem fan could be well optimised already, for an "65 tdp" reasonable cpu doing reasonably low cpu compute if code hardware acceleration work.
 
I think I'll just leave it be for now. If I start to have problems I'll address them as needed. The beauty of using a tiny PC to record surveillance video is that it can be hidden easily.
 
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