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Looking for data on side fan vs bottom fan effect on GPU temps

post #1 of 5
Thread Starter 
Hi Guys,

Trying to find some information on using Side fan or a bottom fan and its effect on cooling the single video card (nonblower). I can find info all over the place for the side fan, but mostly heresay on the bottom fan and I'm not really finding anything on a direct comparison. Sadly my current case is so old it doesn't have an option for the bottom, so can't test it easily myself.


Cheers.
post #2 of 5
Side fan is best when directly cooling a video card. I even modded my Cosmos case for that purpose a few years back (see sig).
 
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BitoHeaven
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post #3 of 5
Side fan placement is key .. and more often than not the side vent is in not below or above GPU. If above GPU exhaust is usually better. If below GPU intake is usually better. Sometimes a side fan does not help at all .. or might even raise temps. Best way to figure it out is to try it different ways and speeds and see.
post #4 of 5
Test it and see, and as already mentioned, the position of the side vent is key. I stopped using side fans a while ago, and never was a fan of bottom fans either. Side fans to be effective need to be large and slow. For bottom fans you need a case that's raised quite a bit over the floor (4" minimum I say), otherwise you just get a noisy fan that moves close to no air.
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post #5 of 5
On my cube v21, I have 2 side fans blowing at my gpu. Mobo is horizontal, with them on medium, around 1200rpm so they are relatively quiet, I get about 5-6c drop in temps... I think this is more about pushing the warm air away from the gpu than the cooling effect of the fan. With the top and sides off, the difference is around 2c.

The gpu temp at initial load takes longer to rise, which is noticeable since the fans take longer to turn on.


This is how my fans are installed, but I am planning to lower them closer to the motherboard tray, add a shroud of sorts to direct the air directly to the fans of the gpu, and add some exhaust above the gpu to direct the heat out of the case so it doesn't recirculate.



This will be how the shroud would look...

The gigabyte 1060 6g that I have runs almost 8c cooler in this case than it did in the CM HAF-XM case that I moved it from. I stay around 55c in the new case, but would run around 63c in the other case which had a side 200mm fan. I think that the 200mm side fan may have been pushing the warm air exhausting from the gpu back down onto it.

Ambient temps were cooler when I was using the older case, so the differential could even be higher.

In 2004 I did a bunch of experimenting...
attachment.php?attachmentid=33087&d=1080326318

Gutted a pci slot blower, added a fan adapter to it with an 80mm Tt smartfan... saw a noticeable increase in speeds compared to a side fan. Back then there were no temp sensors on the gpu. A 9800pro was used in this build.

Previously I had made pci slot fan adapters to blow air onto the front and back of the card, but it was not from an intake.

attachment.php?attachmentid=14776&d=1054757767

A few years later, similar pci bracket fans were sold mainstream.

My feeling is that if the bottom fan is blowing directly on the fans for the gpu, that it will be more effective than a side fan. The side fan should be lower than the gpu slightly to be effective as well. If higher, exhaust would be more beneficial than intake.

A bottom fan more forward than the gpu may direct the front intake airflow above the gpu, starving the gpu intake fan of the cooler intake air. Causing it to recirculate the warmer air in the case through the gpu increasing its temperature.

Each setup will be slightly different depending on case and gpu cooler layout. Longer triple fan coolers may benefit from a bottom fan in front of the psu while shorter ones will have a negative effect.
Edited by EMUracing - 4/15/17 at 2:05am
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