6970: raising power limit in linux?

[dudel42]

I got two asus 6970 running in ubuntu 11.04 x64.

phoenix and hashkill both work fine at stock clock (880).

however, as soon as I go above 895 the hashrate goes up for a fraction of a second and then drops about 50%, which is due to power throttling I'm guessing. Temperatures are fine, ~75C with fans at 70%.

any idea what commands can be used to raise the power limit and increase clocks/hashrate of the 6970 in linux?

thanks.