Originally Posted by B NEGATIVE
Why mount the rad up top
It will give you higher temps... Front intake like in the other pic is ideal. Anyway, my results:
So, there are still too many people running their radiators as exhaust, with one fan or two in push/pull. I have personally tested both configurations in push/pull. The results are below!
Test Setup, CPU Overclock & Other Hardware:
CPU: AMD 955BE @ 4GHz, 1.416v, 20x200. NB at 2800MHz with 1.285v, HTT at 2400MHz at stock voltage.
RAM: 2x2GB G.Skill PI Black @ 1600MHz 8-8-8-24-2T
MB: ASRock 890GX Extreme4 R2.0
PSU: Silverstone ST60F-P Strider Plus 600W
CASE: CoolerMaster Storm Scout
Ambient temp: 15c
Idle temp: 24c
Load temp: 51c
Ambient temp: 15c
Idle temp: 26c
Load temp: 55c
At least in my case (situation and which case I use, pun not intended), intake gets better idle and load temperatures. Differences in ambient, case, CPU, overclock and voltage will all have an affect on temperatures. You can see the results, so I would say it is safe to say that having the fans set as intake will work better in all scenarios, as cool air coming through the rad from outside, and the air exhausting through the top case fan should in theory and in practice, beat exhausting already warm air through the radiator and out the rear of the case. Also keep in mind that the fan against the radiator and not the case will be fighting for air with the top exhaust fan. Warm air rises, which is why it makes sense to run intake in most cases, as the cool air will come in through the rear, and be exhausted by the top fan.
It's currently the coldest month of the year in Australia. We even had a small amount of snow a few days ago. Obviously my ambient temp is quite cold (even for me!) and it affects idle and load temps. In the northern hemisphere it is summer. The higher ambients will also affect your temperatures. There's not a lot that can be done about that, besides aircon, which I don't have, so winter is overclocking season
I hope this testing will make people realise running intake on radiators, especially these all in ones units, is the way to better temperatures. Better temperatures means more voltage can be added and you can achieve a higher overclock!