Help me cool my mobo and CPU by 5C!

[Sunny129]

well its been a few days since i've been back at college. my apartment is about 75-76F (24-25 degrees C), whereas back home the room temp was about 68-70F (21-22 degrees C). now i'm sure all you cooling experts know that ambient case temp plays a very important role in system cooling. now back home, my case fans would suck in 21-22C air and the resulting mobo and CPU (idle) temps were 28C and 32C respectively. now when i got back to school and my case fans began to suck in 24-25C air, there was a drastic difference in mobo abd CPU temps, 31C and 38C respectively. now when i take off the side panel, exposing my mobo, CPU and all components, the mobo temp drops back down to 27C and the CPU temp (idle) is about 31-32C. i dont want to have to remove the side panel to keep it this cool b/c the fans are very loud. i think the noise is mostly coming from my rear chassis fan and the power source fan. now for my questions:

1) What can i do to cool my system the way it was back home or the way it is now with the saide panel removed (i would of course like to achieve these temps without having to remove the side panel for better air flow)

2) Does anyone know of any fans that move alot of air and are quiet? i know that is something everyone would want in a fan, so i would imagine someone in the industry knows that is what people want and have built such fans. i think fan noise is a direct result of how fast it spins, but i could be wrong. i would just like someone to point me in the direction of a quiet, yet very efficient fan.

I know i've posted a few cooling questions in the forums, and everyone's knowledge has helped, but i thought i would consolidate all my cooling problems into one thread...thanks for your advice everyone...

 

[ericd]

That depends on what you mean by a lot. Panaflos L1A's are very quiet and yet don't move all that much air all things considered. Panaflo H1A's on the other hand are still relatively quiet (32 dBA) and yet move almost 40 cfm. But to answer your question no there is no fan out there that radically breaks the CFM/dBA norm. For instance the quietest fan on Gizzo's Fan Page, the Papst 8412NGL has a CFM/dBA ratio of 1.6167, higher being better. The loudest fan Gizzo has listed, the Nidec M33406 has a CFM/dBA ratio of 1.2011. Most 80mm fans fall within the 1.0 to 1.7 range somewhere. For you info the Panaflo L1A's ratio is 1.1429 and the H1A's ratio is 1.2375. The other thing to keep in mind is that the bigger the fan the better the ratio. 80mm L1A=1.1429, 120mm L1A=2.2967.

To answer your other question, yes in general the higher the RPM the louder the fan. There is other factor however including the bearing type and airflow itself creates noise so the more air moved the louder it will be.

Eric

 

[Sunny129]

yes, i also noticed that air flow also plays a role in the noise a fan makes. for instance, people rave about the Golden Orb @ only 26 dBa (while alphas, globalwins, and taisols are all between 32-36 dBa), but i have the Golden Orb, and while the fan may be quiet on its own, the air it pushes through the Gorb heatsink makes quite the hissing noise. in fact i think my Gorb turned out to be louder than it was meant to be, even though it is rated @ 26 dBa. like i said b4, i think most of the noise is coming from the rear chassis fan and the power source fan. now the rear chassis fan can be replaced, but i'm not sure about the PS fan. can i replace it, or would i have to buy a new PS w/ a quieter fan? also, dont forget that i would also like some very efficient cooling since it is quite a bit warmer in the apartment than it was back home over christmas break. when i say alot, and i dont think i did, but what i mean is exactly what i said. i would like the chipset to run about 3C cooler and the CPU temp to run about 5C cooler (that is take the chipset and CPU from 31C and 38C to 28C and 32C respectively). i was able to do this in my house over break, so i dont see why it cant be done here at school, other than the fact that my apartment is a bit warmer. i definitely think more air circulation by stronger fans would help bring down temps somewhat. like i said b4, ambient case temp is very important to consider when trying to cool your other components. a big part of the CPU temp relies on the amient case temp (the temp of the air that blows across its heatsink). the cooler the ambient case temp, the cooler the CPU will run. well thanks for the link. i'll have to take a look at the fans there.

 

[Sunny129]

anyone else have any suggestions for some good fans?

 

[SlickVic]

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