Fan setup

linwelin

linwelin

linwelin

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Hey all, just got my new Noctua NH-U12S setup, a little disappointed with my cpu temp 39c and wish to rule out my fan setup.

I am using a NZXT S340 with the default fans, so it's pulling all air out and none blowing in. Do i need some fans blowing air in on the front ? will it make any difference to cpu temps ?
 
Put 2 front fans in, and remounted the CPU heatsink, and new paste. Temp has slightly dropped 36/37. I will try disabling one of the output fans see if that helps any.
 
Just done an intel stress test, and i the Asus suite i am using reports lower temps than the others, strange ? anyway does anything look wrong ? i googled the voltage levels and mine is high compared to others ?

CPU.jpg
 
Doesn't 340 have 2x FN V2 Airflow fans rated 45 CFM / 0.9 mm H₂O 3-pin variable voltage fans? Not exactly great .. saying they are marginal is a stretch.

NH-U12S fan/s are rated 55cfm / 2,61 mm H₂O and your GPU is using 2x 90mm fans rated about 35 cfm each.

This means component fans rated flow is about 125 cfm while case is only 90 cfm .. with cae fans having almost no ability to overcome resistance (0.7 mm H₂O)

Do yourself a favor and get a couple of PH-F140SP (82 cfm / 1.33 mm H₂O) for £9.95 each and put them in as front intakes on speed control.
https://www.overclockers.co.uk/phanteks-ph-f140sp-static-pressure-140mm-fan-black-fg-024-pt.html

This will give you a rated 162 cfm to components' 125 cfm. ;)

As said, use them as front intakes and not exhaust fans at all. You will probably get best temps with this setup.
Key is to create good front to back airflow so your NH-U12S gets a good supply of cool air. GPU coolers dump heat everywhere, and to improve front to back flow remove all unused PCIe back slot covers. If you can, move your R9 270 down to lower PCIe socket. This will give more space between it and U12S for it's heated air to flow back and out of case. ;)
 
Last edited:
doyll said:
Doesn't 340 have 2x FN V2 Airflow fans rated 45 CFM / 0.9 mm H₂O 3-pin variable voltage fans? Not exactly great .. saying they are marginal is a stretch.

NH-U12S fan/s are rated 55cfm / 2,61 mm H₂O and your GPU is using 2x 90mm fans rated about 35 cfm each.

This means component fans rated flow is about 125 cfm while case is only 90 cfm .. with cae fans having almost no ability to overcome resistance (0.7 mm H₂O)

Do yourself a favor and get a couple of PH-F140SP (82 cfm / 1.33 mm H₂O) for £9.95 each and put them in as front intakes on speed control.
https://www.overclockers.co.uk/phanteks-ph-f140sp-static-pressure-140mm-fan-black-fg-024-pt.html

This will give you a rated 162 cfm to components' 125 cfm. ;)

As said, use them as front intakes and not exhaust fans at all. You will probably get best temps with this setup.
Key is to create good front to back airflow so your NH-U12S gets a good supply of cool air. GPU coolers dump heat everywhere, and to improve front to back flow remove all unused PCIe back slot covers. If you can, move your R9 270 down to lower PCIe socket. This will give more space between it and U12S for it's heated air to flow back and out of case. ;)
Click to expand...

Have just ordered 2 of those fans, will update the post when i get them installed. Thanks for the help.
 
linwelin said:
Have just ordered 2 of those fans, will update the post when i get them installed. Thanks for the help.
Click to expand...

Please do! I try my best to give good advice, but airflow is a fickled witch and often does things unexpected. Makes it hard to 'guess' what will work best .. even when science and math say ti should. :rolleyes:
 
doyll said:
Please do! I try my best to give good advice, but airflow is a fickled witch and often does things unexpected. Makes it hard to 'guess' what will work best .. even when science and math say ti should. :rolleyes:
Click to expand...

I found some Arctic Silver 5 laying around in my box of useful stuff. Thought I would give it a go and see if it would improve anything. It has, temp now sitting at 30c at idle. More in line to the temps I was expecting, with the new fans on the way hopefully will see it drop a little more with any luck.
 
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