push vs pull cpu fans

[chucky9]

now i understand that the cpu fan blows cold air onto the headsink pipes to cool them down but logic insists that if you take the hot air away from the pipes they would cool down faster... no i have just done a test with my cpu
i playting gta 4 on ultra unitl the cpu hit 50 degrees i then left the game and timed how long it took for the cpu to reach 40 degreers which took almost 5 minutes i then did the test again willp the fan pulling air away and it took it down in less than 3. surely this is a indicator that it works.

im running a amd fx 8350 with sttock fan and stock settings of 4.0Ghz i will soon be replacing this by a h100i unless the h110i comes out first
i would love to know people opinions on this as well as any experience they have had,

 

[MauveCloud]

I haven't experimented much with my h100i, but there's two things you seem to be forgetting to consider in your claim about what logic insists:
1. A pushing fan slightly increases the air pressure among the fins and heatpipes, while a pulling fan slightly decreases the air pressure. I would have guessed that high-pressure air could absorb more heat than low-pressure air.
2. The stock cooler for an amd fx 8350 has the fan parallel to the cpu, so it can blow toward or away from the cpu (used to be called "blowing" vs. "exhausting" iirc instead of "push" or "pull"). The results might be different for a tower-style heatsink or a radiator, especially since those open up the possibility of a push+pull setup.

 

[killakallies]

For the stock style heat sink a pulling the air away from the CPU is going to give you the best thermal solution. It works especially well if the air being pulled away is able to be blown out the side panel of the case instead of the heat having to make it's way to the top or back of the case to be exhausted. With a horizontal type air cooler having the air pushed through the heat sink fins and out the back of the case is going to offer more performance. The application of push or pull fans not in a combination fashion is usually dependent on heat sink design and placement!

 

[chucky9]

its just my fan seems to run at a constant medium speed when its pushing air but its runs at higher speeds when pulling air if the cpu is getting hotter.