^^^
The work of the master... all I can say!!!
Unbelieveable... I have never been able to run a card at I20... I just get hardware errors everywhere... Unbelievable
EDIT - 620W from the wall[02:15 US Eastern time]
What PSU are you using? I find that if I overclock mine to that level I can get the hashrate described, but it's not stable. After about an hour or so BAMT cranks the CPU to 100% and everything freezes and I have to reboot. I'm only using a 750W PSU so I thought maybe the overclocking was drawing more power than I thought (I have 3 R9 270s), but if you're only drawing 620W from the wall, then maybe that's not the problem and maybe it's just an issue with BAMT.
Thoughts?