speaking from personal experience, the main graphics card *the one the monitor is plugged into, ie card 0* is the more important of the 2 and card 1 runs cooler, so just a quick tweak with atitool and you can do the volts for both mem and gpu on card 0. just set it the regular way in bios for card 1... you have about a 80% chance it wont crash out on you. i just wish i could get over 850 on my gpu's
*edit*
ALSO
ive found that they hynx 1.1 memory bios version is more stable. used to crash all the time now no crash at all... i thought 2900pro's were supposed to have hynx 1.0's but i guess i got 1.1's so if you have flashed from a pro to xt, and are on 1.0 try the 1.1's to get a bit higher memory clock. im running the mem at 990 with stock voltages.
here is my rig
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