I got 4 of these a few weeks back I do 880/350 mem and get about 350mh with pheonix+phat miner. One of the cards is a little bitch and I had to set it at 850/350 to stabilize it. Other than that they have been working fine other than my friends diamond 5850 did 410Mh without any effort.
temps?
also how do you use the phoenix back end for guiminer? I select new openCL miner and then the bitcoin directory comes up and asks me to select a miner.
I was really weirded out by getting a crash at 800/1000 randomly after 10 minutes.
Also: what ballpark increase did the downclocking of memory give?