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Experimentally determining the coldest I can get with air - Page 2

post #11 of 12
Ah. The clarification is perfect. My own question should have been something like the big central fan in intake vs exhaust, but you left it off.

Good work on that duct. Most of us try to make our entire case one big duct. The faster the fresh air flows through the heatsink the better our temps will be. This is why covering your top improved your cooling in 9. and why a side exhaust fan hurt your cooling: it took away from the stream of air your were blowing through your heatsink.

Of course, with your duct you are doing what most of us try to accomplish with our cases.
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alpha updated
(19 items)
 
secundus
(14 items)
 
 
CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
Hard DriveCoolingOSMonitor
Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
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post #12 of 12
Quote:
Originally Posted by JamesWatt View Post
7. Controlling for ambient temperature
One problem I ran into was controlling for the ambient temperature. A suggestion I was given was to report CPU core temperature – ambient temperature instead of just CPU core temperature. For example, if CPU was 70 degrees C and ambient was 20 degrees C, I would report 50 degrees C. One concern I had was that I’m not sure that CPU temperature varies linearly with ambient temperature. Can anyone shed light on this?
CPU load temperature almost varies linearly with ambient temperature.
See graph 1 below. (It was done a little while ago by graysky to whom credit is due).
Or, instead of reporting the differential, you can always report both the CPU core load temperature and the ambient temperature.

Quote:
10. Improving the duct
I imagine if you add one more fan (at the green location in pic 2) after the CPU heatsink as a 'pull' fan, it might bring some thermal benefit.

And, with this 4-fan duct setup, the CFM of each fan should be well coordinated/synchronized.

Quote:
Future actions
•I will try adding some more space between the heat-sink and fan.
•I will try cooling the air before it enters the duct.
What do you mean by 'adding more space'?
And, I am eager to see your attempt to cool the air intake.

Keep your good report coming!

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