Claymore,

I have 42 Radeon 7970's. I've been mining with your miners for a year. I get 1.17KHs with 12.0 on a 4 card rig but every version after that lowers my hashrate.  I just tried 12.4 and same problem. All cards hash slower. Getting 1.05 max.

Any suggestions? I have increased the voltage but that doesn't seem to do it.

Thanks.