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Author Topic: Using my 5850 in ubuntu now.. can't overclock and only getting ~280 Mh/s  (Read 676 times)
Jr. Member
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August 28, 2011, 11:54:21 AM


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.

Too lazy for a fancy sig.. Tongue
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August 28, 2011, 12:43:49 PM

I'm running Sapphire 5830s on Ubuntu that do higher than that. You can use aticonfig to set higher clocks but I prefer to use the atitweak util available on these forums. It's a bit simpler and works better for me when ssh'ing in to control it.

I'm also using 2.4 SDK and 11.6 drivers - don't know if that make a difference though. I;m also using Phoenix with phatk kernel. I get about 310-320 from the 5830s so the 5850s must do better. It's not Ubuntu that's stopping it anyway - must be something else.

I didn't flash my BIOS or anything like that. But I did install everything manually (not from the repos) using the Ubuntu Headless Install tutorial on this forum.

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August 28, 2011, 04:18:51 PM

The 11.6 drivers allow you to overclock with aticonfig to whatever you want.  Those drivers are much better than what Natty comes with too.  You can use this guide to uninstall the old ones and reinstall new ones:

But remember to change it so that you download 11.6, NOT 11.8.  Happy mining Smiley.
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