I have seen that before, and it was a defective factory application of thermal compound on one of the components.
If you are technically oriented and dont fear losing your warranty (some brands are better than others in this regard), you can remove the heatsink from the PCB and reapply the thermal compound to all the surfaces that should be in contact with the heatsink.
Topic: R9 290 low hashrate (Read 1164 times)
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.
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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