OP, I am running three Sapphire Xtreme 5830s on one machine at 1010/300 getting 327MH/s each.
However my XFX 5830 (on other machine) crashes every few days no matter what core/mem is set to. Haven't figured it out yet. Might just sell it, and get more Sapphires. They don't seem to crash on me.
Yeah! My XFX always has a ton of hardware errors when I check it, and it can't clock as high either! It was my first card I got, I picked it up mostly for the lifetime warranty, but I will probably never get any more. I can't even take the sink off without voiding the darn thing.
Thanks for the info, I'll give it a shot.