I've got the xfx 5830 set to 1010c/600m , the reason for 600 mem, is that the xfx is my main and browsing etc, it becomes unstable and crashes if set any lower than 600 memory. For the sapphire, I am testing atm, but seems to be very stable at 1020c/300m, in a few hours or in the morning I am gonna bump the sapphire up to 1030 then > 1040.
ATM I am mining @ 635 Mhash/s. The sapphire is spitting out 320 Mhash/s. The xfx is spitting out 315 Mhash/s. It fluctuates, but yea, I might try the pheonix as I am on a newer driver and sdk and see how it goes.
I'm gonna create a new thread about my PSU. Got a question, for anyone to answer.