cracking performance doubts

[raist2]

Hashcat 15 is slower than 14.

have you tried overclocking? i've got your same setup, except 4 7970s. I've got them at 1165 with no probs.

aticonfig --adapter=all --odsc=1165,1050 --od-commitclocks

Thanks, I was wondering how to overclock in linux and you greatly helped!
This not solve me to reach 84 Million for DES as reference but gived me a great boost
raist