I'm a proud owner of a system with dual 6990s and the problem that I'm having with hashkill is that my queue keeps running dry. I understand that there is a work around (by spawning multiple hashkill instances), but has there been any progress in keeping the queue saturated? I think that this would be the single biggest improvement for me (considering that I've upgraded to dual PSUs so I'm thinking about about getting a 3rd 6990 for my system), which would make me extremely happy and warrant a donation...

I had a 650WCorsair PSU and could only run the card on 830MHz (but then again my CPU is a i7-2600. I recommend getting a stronger PSU if you want to run two cards, I got a Thermaltake 1200W for my system running 2 cards @ 880MHz.

On a side note, when people get 800MHash/s on the 6990, how do they go about that?
I average about 310-320MHash/s per 880MHz GPU core (running Ubuntu 10.04 x64, Catalyst 11.5, 2.4 drivers, and Phoenix 1.48). On my Windows 7 x64 box I get 343 MHash/sec on Phoenix 1.48 and the latest drivers/SDK. Suggestions?