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Title: Tuning Post by: zaloultra on January 14, 2014, 12:51:58 AM 7970s are exquisitely
sensitive to memory speed and amazingly overclockable but please make sure it keeps adequately cooled with --auto-fan! Do it while it's running from the GPU menu. Go up by 25 at a time every 30 seconds or so until your GPU crashes. Then reboot and start it 25 lower as a rough start. Runs stable at 1900 memory without overvolting. Overvolting is the only thing that can actually damage your GPU so I wouldn't recommend it at all. Then once you find the maximum memory clock speed, you need to find the sweet spot engine clock speed that matches it. It's a fine line where one more MHz will make the hashrate drop by 20%. It's somewhere in the .57 - 0.6 ratio range. Start your engine clock speed at half your memory clock speed and then increase it by 5 at a time. The hashrate should climb a little each rise in engine speed and then suddenly drop above a certain value. Decrease it by 1 then until you find it climbs dramatically. If your engine clock speed cannot get that high without crashing the GPU, you will have to use a lower memclock. What do you think?? |