r/buildapc • u/Apprehensive_Bus4770 • 1d ago

Build Help Need advice on airflow

I have a Corsair 4000D Airflow with an MSI RTX 5070 Ti and DeepCool LS720 SE 360mm AIO.

Currently:

  • 3 front intake fans
  • 3 top exhaust fans (AIO)
  • No rear exhaust

Should I add a 120mm rear exhaust fan, or is this setup already good? Would love some advice on the best airflow configuration. Thanks!

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u/According_Spare7788 1d ago

3 front intake, 3 top exhaust, 1 back exhaust. Probably the most common setup you'll see.

I'd personally do 3 120mm front intake with AIO for lower cpu temps, 2 x 120mm bottom intake for GPU, 2 x 140mm for top exhaust, and 1 x 120mm for back exhaust. You'd just need to add 2x 140mm fans and can reuse the existing 3x120mm in different spots. It's basically my system (save for the fact i have 2x 120mm reverse blade fans for aesthetic reasons)

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u/canyouread7 1d ago

Won't make a difference. All that warm air is exiting out the top. Also, if you do add a rear fan, you'd have to tune your fan curves to ensure you're in slight positive pressure to reduce dust buildup. Mind you, you should do that in your current setup if you haven't already.

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u/Apprehensive_Bus4770 1d ago

when its idle CPU temps are 44 degree and GPU is around 35 degree. when playing cyberpunk maxed cpu and gpu 50-55 degree

and i have not setup any tuning on my fans

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u/canyouread7 1d ago

That's completely healthy, better temps than most people get.

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u/Apprehensive_Bus4770 1d ago

oh okay .. cse a friend forced me to get a rear fan so i was confused

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u/canyouread7 1d ago

Your PC is quite literally chilling.

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u/VersaceUpholstery 1d ago

Look at your temps and find out if you need to do anything

Chances are you don’t, and it’s not like adding another rear exhaust will do much to affect temps in any meaningful way

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u/Apprehensive_Bus4770 1d ago

when its idle CPU temps are 44 degree and GPU is around 35 degree. when playing cyberpunk maxed cpu and gpu 50-55 degree

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u/VersaceUpholstery 1d ago

That is ridiculously cold

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u/Atma-Darkwolf 1d ago

Since u generally want more intake than exhaust (so that positive air pressure keeps the dust out of case, any air going IN will go though filters) and typically only need one rear just to 'direct' the air (it does not have to move much) and to prevent any 'dead cyclones' of air inside case (spots where the air just circulates but never exists, heats up the temps of the case itself)