GPU Running Hotter in New Case

[Guest]

NZXT S340 Elite - AMD R9 290 - AMD Ryzen 1700 - NZXT Kraken X62 CPU cooler

Moved my R9-290 to my new build which has the fans and radiator on the front of the NZXT S340 Elite case. It has two front intake and a rear exhaust and a top exhaust. The CPU stays cool but in like Andromeda it gets up to 78. I've increased the intake fan speed to 100% when it hits 65. It will get up to 78 and hold. Only thing I think to help is maybe turn the top fan into an intake to allow more cool air in, OR both turn both exhaust into Intakes making it a fully positive air pressure system. So should I turn neither, one, or both?

 

[Aeacus]

What case fans you have? (Make and model or part number.)

 

[Guest]

Intake fans are on the NZXT Kraken X62 RL-KRX62-01 280mm [https://www.newegg.com/Product/Product.aspx?Item=N82E16835146056] and the top fan is an NZXT 140mm [https://www.newegg.com/Product/Product.aspx?Item=9SIAA8S3TT7767] and Rear fan is whatever came in the case.

Was thinking of adding a PCI fan since all the heat is going in the bottom of the case and there is nothing to pull it out? But a lot of reviews for them say they are loud and cheaply made.

 

[Aeacus]

Your exhaust fans (140mm FN V2 at top and 120mm FN V2 at rear) have poor performance and i would replace them,
specs: https://www.nzxt.com/products/fn-v2
FN V2 fan can only do 45 CFM at 0.9 mmH2O.

For replacement fans, i suggest Noctua NF series.

For 140mm fan, a Noctua NF-A14 PWM,
specs: http://noctua.at/en/products/fan/nf-a14-pwm/specification
NF-A14 PWM does 140.2 CFM at 2.08 mmH2O.

And for 142mm fan, a Noctua NF-F12 PWM,
specs: http://noctua.at/en/products/fan/nf-f12-pwm/specification
NF-F12 PWM does 93.4 CFM at 2.61 mmH2O.

pcpp: https://pcpartpicker.com/products/compare/dwR48d,b2vRsY/

Your PCI fan wouldn't do you any good since hot air rises.

For better cooling, you should aim for a negative pressure and not for a positive pressure. Positive pressure can lead to stagnant air. Stagnant air leads to higher internal temperatures since there aren't enough fans removing the heated air from the inside of the case.
Further reading: http://www.tomshardware.co.uk/faq/id-1858957/airflow-101-setting-fans-keeping-computer-cool.html

With Noctua fans, you should be able to achieve negative pressure. Provided that your 2x exhaust fans are drawing out more air than your rad with 2x 140mm fans can pull in.

 

[Guest]

Thanks, ill give it a shot