Back when I had a watercooled 5970, I used to have this exact same problem: it turned out, the GPUs were running too cold. It happened mostly after a bootup, as heat rose with time, the error happened more scarcely.
Check your temperatures. If they're close to ambient, chances are they're too low.
I don't have a solution to offer though, sorry.
Check your temperatures. If they're close to ambient, chances are they're too low.
I don't have a solution to offer though, sorry.







