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RE: "Running for 2+ hours now! (1050/1650/1.075 @ ~620KH/s, 66C, powertune 10, fanspeed ~65%) Great temperature for the speed I'm getting! You think there's room for improvement?"
Nice! Very, very nice. And surprising that the temp is so low while the memory is dialed all the way up to 1650. Must be because the volts are lower at 1.076. Nice. I recall some saying it's kinda luck in terms of how good of GPU chip one gets in their 7950's. Some are absolutely better chips than others. In fact their all 7970 chips, but those that failed to test perfect end up as 7950's with a part of the chip effectively disabled if I recall correctly.
At any rate there is no other card that is as energy efficient as the 7950s and with electricity costs being what they are it only makes sense after factoring electricity costs to run 0nly 7950s. There are some links somewhere about this topic.
Anyway I too tested down to just over 1.2 volts or so and things were just too unstable for my rig there. Then later the replacement card is voltage locked to the boost on/off switch, unlike prior card(s). And the Asus cards are both voltage locked. Something like Trixx may say it's altering the Asus voltage, or even a locked Sapphire but further verifying that wiht 50miner's overclock tab, or whatever, will confirm the real voltage levels, whatever they truly are, or are not.
In your case it appears yours are at the voltage claimed and that's great as long as doing simple tasks on the rig while it's running doesn't combine to crash the rig.
Caveat emptor - let the buyer beware!
I tried updating the videocard drivers and the APP SDK version, but it crashed cgminer quite early on. Now I'm trying to revert back to older versions CCC12.8 and APP SDK2.7 but I can't seem to succeed.. cgminer keeps crashing on startup, already removed all .bin files..Nice! Very, very nice. And surprising that the temp is so low while the memory is dialed all the way up to 1650. Must be because the volts are lower at 1.076. Nice. I recall some saying it's kinda luck in terms of how good of GPU chip one gets in their 7950's. Some are absolutely better chips than others. In fact their all 7970 chips, but those that failed to test perfect end up as 7950's with a part of the chip effectively disabled if I recall correctly.
At any rate there is no other card that is as energy efficient as the 7950s and with electricity costs being what they are it only makes sense after factoring electricity costs to run 0nly 7950s. There are some links somewhere about this topic.
Anyway I too tested down to just over 1.2 volts or so and things were just too unstable for my rig there. Then later the replacement card is voltage locked to the boost on/off switch, unlike prior card(s). And the Asus cards are both voltage locked. Something like Trixx may say it's altering the Asus voltage, or even a locked Sapphire but further verifying that wiht 50miner's overclock tab, or whatever, will confirm the real voltage levels, whatever they truly are, or are not.
In your case it appears yours are at the voltage claimed and that's great as long as doing simple tasks on the rig while it's running doesn't combine to crash the rig.
Caveat emptor - let the buyer beware!
EDIT:
Fixed it myself, seemed to be an OpenCL issue. After removing drivers and reinstalling the older ones, the OpenCL database didn't rebuild properly. Followed this simple guide to fix it: http://forums.guru3d.com/showthread.php?t=359883
Back to boosting my GPU!
