Bitcoin Forum

Added a new Sapphire 7850 - and can't seem to adjust any of the overclock settings.  I tried several of the overclock apps, even tried triXX, but it just shows "0" for clock speed and memory speed, and if I hit "+" it goes to 1 and then back to zero. (VGA SAPPHIRE|100355-1GOCL HD7850 1G)

What am I missing?

Does your motherboard have an onboard graphics chip? Are you sure triXX is reading the 7850?

Can you modify it in the AMD "Vision Engine Control Center"? (Performance->Overdrive->"tl;dr - 'I ACCEPT'"->enable "Graphics Overdrive"->"Configure Graphics Overdrive")

If you just need to overclock the card for mining BTC then you can set the gpu-engine and gpu-memclock from within your config file using cgminer.  If you want an example of a working 330MHash/s config file for the 7850 there is one at http://www.brandonorndorff.com/bitcoin/mining/radeon-hd7850-7870-cgminer-config-settings-bitcoin/ .  It was a post for 300MHash but has since starting changed a few times and is running stable at 330.

Using cgminer you can configure and overclock without actually using third party software only when mining.

I don't have the overdrive option under the ATI control panel.  I've uninstalled the ATI drivers, rebooted, reinistalled new drivers, rebooted, etc.

http://farm9.staticflickr.com/8263/8707243773_04023329ff_d.jpg


Even with the current ATI drivers, no software seems to be getting the GPU clock, mem clock, GPU temp information from the card:

http://farm9.staticflickr.com/8277/8707243625_1ac87b3635_d.jpg


I assume this is why TRIXX can't overclock the card (nor can CGMINER).

Any ideas?

 Don't push your card too hard or you might have heat issues. Unless you have good cooling.