I should say you need to be running linux. Windows seems to be very slow at this. I just dropped a 7950 into the I7 rig and it doesn't seem to have made much difference to the speed. Anyone know if these scripts benefit from GPU power?
On the 25 gpu rig they use a program called Hashcat. It can run millions of guesses a second on a cpu only rig, billions with a gpu cluster. I emailed the developer to see if it could be used for wallet recovery. Haven't heard back yet. I'll keep you posted if anything develops.