Using diablo linux, with -f 10 -v 2 -w 128
got two 6950 cards, with a combined hashrate of 666 Mh/s
had to switch to a different pool after mining for several minutes on your pool with a ratio of 82 accepts / 74 rejects
Oh well... Diablo isn't working properly for some technical reasons; Diablo changed some stuff in his miner few weeks ago and refused to "fix" it to be backward compatible. Please use another miner (I recommend phoenix or poclbm).