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reverse direction of air flow on downdraft cooler?

post #1 of 10
Thread Starter 
Ok. I have a downdraft style Noctua cooler I inherited. I was wondering if anyone has experimented with mounting the fans on downdraft style coolers to pull air instead of push, turning them into 'updraft' coolers rather than downdraft. I would be interested in any results of tests out there.
Thanks,
Nub
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post #2 of 10
dont think it would make much difference tbh!
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post #3 of 10
No clue...I can't really be bothered to test it on mine. Test it on yours and see what happens.
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post #4 of 10
I like it to blow toward the mobo to help keep mosfets/nb/ram to run cooler. Plus, if you have a sidefan and point the HSF fan toward it, your airflow will get messed up.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by corky dorkelson View Post
I like it to blow toward the mobo to help keep mosfets/nb/ram to run cooler. Plus, if you have a sidefan and point the HSF fan toward it, your airflow will get messed up.
Very good point. Probably would be best if I put a duct between side intake fan and cpu cooler fan.
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post #6 of 10
It's going to suck, pun intended.
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post #7 of 10
Not nescassarily going to suck.

The problem with downdraft coolers under load they blow heaps of hot air onto the mosfets etc- providing pretty much no cooling.

If you carry the air across these first then out it might raise your cpu temp 1c but the mobo wont get that much hotter under load.

Would be interseting to see a comprehensive test done
    
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post #8 of 10
here's the thing though. the mosfets run HOTTER than the cpu, so the warm air it's blowing onto the mosfets, actually will COOL them. however, if you reverse the flow, it's going to start sucking up all that hot air from the mosfets and other very hot components, increasing the temps (if the air is hot enough)
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post #9 of 10
To those who think that your CPU cooler is blowing hot air onto your motherboard: Have you ever felt the air coming out the back of your CPU cooler? My SI-128 SE with a Panaflo H1 blows pretty damn cool air out - certainly cooler than my northbridge heatsink. It might not be as optimal as strapping a 40mm fan directly to the northbridge, but it's a hell of a lot better than nothing.

In regards to the question, it somewhat depends on the case. In certain cases where the power supply exhaust fan is directly above the CPU socket, flipping the CPU fan around could help the overall airflow of the case and while it might not provide superior CPU temperatures, overall temperatures inside the case and on other components would likely improve.

I wouldn't do it in a standard ATX case however - there's a reason fans are always blowing through a heatsink instead of trying to pull air through it. The reasons have to do with static pressure, and I'd be lying if I knew exactly what it entailed physically, but fans are less efficient drawing air through a heatsink than pushing air through it. There's also the reasons people have already mentioned, that the heatsink is also assisting northbridge/MOSFET and even RAM cooling, and since the base of the heatsink is also attached directly to the CPU and has fins on it, CPU temperatures will also be affected in that respect as well.
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post #10 of 10
Thread Starter 
Quote:
Originally Posted by RayvinAzn View Post
To those who think that your CPU cooler is blowing hot air onto your motherboard: Have you ever felt the air coming out the back of your CPU cooler? My SI-128 SE with a Panaflo H1 blows pretty damn cool air out - certainly cooler than my northbridge heatsink. It might not be as optimal as strapping a 40mm fan directly to the northbridge, but it's a hell of a lot better than nothing.

In regards to the question, it somewhat depends on the case. In certain cases where the power supply exhaust fan is directly above the CPU socket, flipping the CPU fan around could help the overall airflow of the case and while it might not provide superior CPU temperatures, overall temperatures inside the case and on other components would likely improve.

I wouldn't do it in a standard ATX case however - there's a reason fans are always blowing through a heatsink instead of trying to pull air through it. The reasons have to do with static pressure, and I'd be lying if I knew exactly what it entailed physically, but fans are less efficient drawing air through a heatsink than pushing air through it. There's also the reasons people have already mentioned, that the heatsink is also assisting northbridge/MOSFET and even RAM cooling, and since the base of the heatsink is also attached directly to the CPU and has fins on it, CPU temperatures will also be affected in that respect as well.
Thanks for the input. +rep
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