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Title: GPU overclocking relation to hashing power, hanging Post by: warsmith on June 01, 2011, 04:06:55 PM Hello everyone.
I was farming with a single XFX 6950 (flashed shaders, 1145mV, 940mhz core/ 625mhz memory ~ 405mh/s) for a while now, and got another one today. Curiously, when I stuck it in, overclocked it with MSI Afterburner, they make the entire system hang in around 3 minutes. At first its the UI, then the mouse freezes as well. Now I'm running them both at 1145mV, 920mhz/625mhz at around 390mh/s or at a total of 780mh/s and it seems stable. Should I up the voltage, or the memory clock, or something for them to be stable at 940mhz core? I am not sure since if it would lack juice it would hang immediately, not after 3-5min of hashing. The temperatures don't go above 75'C. The power supply is a Corsair TX750 V2 and I'm using GUIMiner. Title: Re: GPU overclocking relation to hashing power, hanging Post by: mattpker on June 05, 2011, 06:03:17 AM I have the same issue with two unlocked MSI 6950's and that same powersupply. I think it has to do with what is related in these two forums:
http://forum.bitcoin.org/index.php?topic=4669.0 (http://forum.bitcoin.org/index.php?topic=4669.0) and http://forums.amd.com/forum/messageview.cfm?catid=390&threadid=128404&enterthread=y (http://forums.amd.com/forum/messageview.cfm?catid=390&threadid=128404&enterthread=y) Looks like we need to wait for driver updates to resolve the issue. When you do your overclock, make sure GPU-Z is not running. I have found that this and other applications cause the freeze you are describing. |