I realize this thread hasn't been touched in a few days but it seems like the best place to post my questions, so here goes nothing ...
I've been trying to optimize a Sapphire 6970 with limited success. I've gone through the settings recommended in several threads, this one and this one (http://forum.bitcoin.org/index.php?topic=13809.0) in particular, as well as those listed in the Mining Hardware Comparison wiki, but have not been able to break the ~385 MH/s mark. It's a little frustrating when it seems I should be able to squeeze another 20+ MH/s out of it with out much more trouble. There's also the chance I can get my hands on another 6970 and I'd like to get this figured out before I start on a new one.
I'm on a Win7 64 machine with the most recent Catalyst and SDK. Right now I'm getting about 380-385 MH/s with this configuration in the latest (6/14) guiminer/poclbm: -w128 -f0, with GPU settings (ATI Control Center):
Core: 950
Mem: 685
Power: +20%
Adding -v knocks off nearly 50 MH/s. I tried duplicating 2nd_lawl's Afterburner settings above (assuming stock voltage at 1.175 V) and was only able to get to the 340 Mh/s range. Adding -v and bumping the voltage in the CCC added hardly anything. I also experimented with datguywhowanders's settings (-v -w64 -f0, +7%, not sure on clock/mem) but couldn't break 350. It feels like I'm getting close but I'm obviously still missing something.
Does anyone have any suggestions, anything I missed? That last 20 MH/s is starting to feel a little personal.
Also, while I'm here, what effect, if any, does the CPU affinity selection have?
Thanks in advance for any thoughts!
I've been trying to optimize a Sapphire 6970 with limited success. I've gone through the settings recommended in several threads, this one and this one (http://forum.bitcoin.org/index.php?topic=13809.0) in particular, as well as those listed in the Mining Hardware Comparison wiki, but have not been able to break the ~385 MH/s mark. It's a little frustrating when it seems I should be able to squeeze another 20+ MH/s out of it with out much more trouble. There's also the chance I can get my hands on another 6970 and I'd like to get this figured out before I start on a new one.
I'm on a Win7 64 machine with the most recent Catalyst and SDK. Right now I'm getting about 380-385 MH/s with this configuration in the latest (6/14) guiminer/poclbm: -w128 -f0, with GPU settings (ATI Control Center):
Core: 950
Mem: 685
Power: +20%
Adding -v knocks off nearly 50 MH/s. I tried duplicating 2nd_lawl's Afterburner settings above (assuming stock voltage at 1.175 V) and was only able to get to the 340 Mh/s range. Adding -v and bumping the voltage in the CCC added hardly anything. I also experimented with datguywhowanders's settings (-v -w64 -f0, +7%, not sure on clock/mem) but couldn't break 350. It feels like I'm getting close but I'm obviously still missing something.
Does anyone have any suggestions, anything I missed? That last 20 MH/s is starting to feel a little personal.
Also, while I'm here, what effect, if any, does the CPU affinity selection have?
Thanks in advance for any thoughts!