You could probably push that 5970 a bit further. Are you over clocking your cards? My 5970 is getting ~ 760 with room to spare.
I have, but for some reason anytime I overclock it becomes unstable and freezes leading to me uninstalling/re-installing CCC and drivers. I have a feeling that it's because the card isn't overclocking on system boot, only when CCC is opened, so I'm going from the base clock and making a jump and the video card crashes.
I do have a bit of experience in oc/ing (my 3930k is running @ 4.65 with a top temp of 72c under stress, and that's with low end ram) and this one has me baffled, would love some help.
Also, sorry about the late reply and thank you for being so responsive. I'm begging to like the mining community, it's a fresh take from most I've encountered.
Also, Deafboy.. Your signature link seems broken.