Hi there. This is my first post. I am writing in english because i dont know romanian. I hope this will not pose any problems. As title states i will be testing CPU coolers on a GPU. It is not a new thing and it was done before like poparamiro did and still do. Here i want to show how different coolers behave on GPU. I tested four coolers: old faithful TRUE, Zalman CNPS 10x Performa, Coolermaster Hyper 212X and small 92 mm fan heatsink Scythe Byakko. The graphics card used is ASUS GTX580 Matrix Platinum. Good thing about this card is that it has VRM built like tank and in asus gpu tweak utillity with updated firmware i can go up to whopping 1.6 V on gpu. Very high voltage for fermi. I also removed IHS from gtx 580 and soldered contact points to disable OCP.
Testing is done in a open case which i modifited for CPU coolers. I am using push-pull fans on all coolers. The motherbord is microatx which ends with pci-express slot. Also there is a hole inside a case so push fan can easily get fresh air.
For TRUE, Zalman and HYPER 212 x i used 2x1650 rpm phobya fans - two generic fans, nothing special.
For Scythe byakko i used stock scythe fan which comes with byakko for push and revoltec for pull. Both were running at 1800 rpm.
Ambient temperature across all testing was 25-26 C.
Thermal paste used is Arctic cooling MX-2.
I tested with furmark extreme burning mode 1024x768 windowed.
Maximum voltage used is 1462mV on vcore, everything else i left at stock. Sadly i couldnt rise voltage any higher because my power supply restarts.
The power consumption on 1462mV on core is immense, almost 600 W just for a GPU alone.
As you can see on very high voltages only Hyper212X failed. Surprise of this test was small Scythe byakko which managed to cool gpu on 1436mV. It can handle around 400 W TDP on a 520 mm die size. TRUE is the best of course and Zalman Performa is also very good.
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