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January 11, 2014, 03:40:25 AM |
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I am struggling to get decent hashrate from my new ASUS R9290-4GD5. Tried various settings in cgminer, over- under-clocking via CCC or cgminer options, switch between different linux and windows boxes, GPU bios switch, etc.
The problem is that when I start cgminer with cold card it produced normal hasharate for less than a minute. 5s average was was showing 830-840, than it drops to 600+, than goes back, and so on. Then after approx 15 minutes it stabilized at 610 kh/s.
This led me to the conclusion that card throttles somehow because of temperature, although cgminer was showing only 72C.
So, I moved my case from spare bedroom, where temperature was 20-22C, to the garage, where temperature currently is +5C, and directed household fan into one side of the open case.
In the garage it showing the same types of hashrate swings from 830-840 to 720-730, and after 10 minutes hashrate stabilized at 787 kh/s. So clearly temperature plays a role. But I can't imagine how else I can cool it down, as it is already out of the case on a riser (unpowered), in +5C environment, with household fan pointed to it. My PSU is EVGA Supernova rated 1000W, it is unlikely a problem.
Is card defective?
Any suggestions greatly appreciated.
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