Just a quick question, would this miner work on 6990 ? These cards have 2x2GB of memory and they mined Eth pretty good... Just asking because I can get two of those for free... that's 4 GPU's more 
Yes it definately works with the 6990.
Total speed 10 H/s using only 300 Watts (both cores)
This seems terrible, the 7870 with 2gbs gets 100-110 H/s and uses ~140-150 watts.