Hi Ferris
I've been looking at those card for a couple of days, do you know how many watt they consume from the wall?
I would assume they should at least be hashing with 700 kh/s and watt consumption at 200watt for each card.
A normal 7950 card:
Memory Clock 5000 MHz
Memory Size 3072 MB
Memory Bus 384 bit
Yours:
Memory Size 4096 MB Size
Memory Bus 256 -bit GDDR5
Memory Clock 5600 MHz Effective
Faster memory clock, but not being able to transfer at the same speed - but 1 gb more when it does..

I have Gigabyte underclocked R9 280X they consume around 230-235 watt each card and produce 705-710 kh/s
well I got my computer plugged into a backup psu and it's saying 335 watts that's reading the computer with both video cards. If you do end up buying one and end up getting 700kh/s PLEASE tell me how ... I am a noob when it comes to this stuff I don't understand what any of the settings are I'm just copying other peoples setups in the .bat