So i've taken one of my 5850's out of my server (Windows 7) and moved it into my desktop, Ubuntu 11.04 Nattty! Problem is my hashrates have dropped significantly. Only getting around ~280 Mh/s on Ubuntu where I was getting ~380 Mh/s on Windows!
Here's my current setup in Ubuntu:
Ubuntu x64 11.04 Natty
ATI Stream SDK v2.1
Not really sure what version of ATI drivers i'm using.. Ubuntu installed them. From looking at the Catalyst Centre the driver packaging version is: 8.84.6-110324a--116088C-ATI
I'm using Phoenix miner and also the Phatk kernel from July 17th, I've read this is most suited to 5xxx cards.
Main issue is that I can't seem to overclock the card to higher than 725. How can I do this? Do I really need to flash the BIOS as that would be my last port of call.
Also, should I be using another Stream SDK version? I must admit that I think I was using 2.2 on my windows box.
Any ideas appreciated. Thanks.