Exhaust fans

sweols

sweols

sweols

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4 Dec 2014
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I've got 1 rear 120 mm fan
2 140mm fans at the top.

By putting hand just a few inches away from fans you can tell the 120 mm fan is getting rid of a lot of hot air whilst the 140mm fans are much cooler... Is that because it's over a larger area or am I getting rid of valuable cold air that should stay...

CPU Cooler fan is angled towards the rear.
 
I'm a believer in air washing over the appropriate components, rather than more fans. It's generally what produces lower temps when I've tested.

More fans doesn't always mean cooler temps.

The important question is whether a single rear exhaust can cope when both your CPU and GPU are stressed to max, or whether more exhaust fans actually help out at that point, despite them exhausting cool air when things aren't fully stressed.

You can test yourself by keeping an eye on CPU/GPU temps while stressing with the same program/s. For example, run Valley and Realbench (stress not benchmark) at the same time, and mess with turning the top fans off/on.
 
What's your overall set-up regards fans? Are you running more exhaust than intake? That's not optimal, you really want more intake than exhaust to create positive pressure. Overall you want air to get out of your case, not bring it in. That's a nightmare for dust and won't help temps either.

I realise that may sound like a contradiction, as with more intake than exhaust you ARE bringing more air in, but the net result of that is positive pressure which actually pushes air out of your case. This is what you want.
 
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Its only marginal though isn't it. When I first started learning about building my own pc and configuring my components, I was expecting these fans set ups to be significantly different, but its really not.

I can barely feel my fans even if I put my hand right next to them. If I hold a flap of paper it doesn't really move until less than an inch from the fan. I'm not using exhaust fans at all at the moment - 2x120mm intakes and 1x120mm cpu fan on push. I can just feel a slight breeze coming out the rear of the case if I put my hand there.
 
I'm using Asus Ai Suite to control fans. GPAU fans don't kick in til about 55c.

Fans are on silent when browsing. Normal when gaming.. If I set it to performance it sounds like a jetplan. Two 140 intake 1 120 exhaust and 2 140 exhaust.

Looks like ibam getting about 60-65c on cpu ( load ) and about 72-74 on GPU.. This is all at stock by the way... Might need to set a fan curve rather then selecting mode.. P400 Case
 
What case are you using? My experience is generally top fans tend to pull heated air coming out of GPU up around CPU thus warming the air going into CPU. I worry more about having good intake fans with filters and often don't even have exhaust fans. Good intakes will overcome the grill and filter resistance to draw in plenty of air and push it on through the case no problems. Having case fans speed controlled by component heat, just like CPU and GPU cooler fans, means case flows are as demands need. This keeps system much quieter at lower workload becasue fans are not spinning / moving air components don't need except when working hard. You might find this if interest. It's old and I need to edit in more info about fan speed control and how a case only flows the lessor of intake or exhaust fan flow (what goes in must come our / what comes out must go in). https://forums.overclockers.co.uk/showpost.php?p=26159770&postcount=7
 
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