Originally Posted by michintom
No idea how to do that.
Post a screenshot of GPU-Z for each gpu to show if ULPS is active on your rig/cards.
If it is active, you need to disable it in the registry:
- open start/orb menu and enter "regedit" in the search box and press enter
- if prompted, click "yes" to open the registry editor
- when the registry editor opens, select/highlight "Computer" at the top of the left column and then when it is selected/highlighted, click "Edit" in the top menu and then click "Find" - or just press "Ctrl + f"
- When the "Find" window opens, make sure all three "look at" options are selected, and in the "Find what:" box, enter:
- click the "Find Next" button to search the registry
- If it is found, change the value from 1 to 0 to disable ULPS, then click "Find Next" again to continue searching the registry
- Repeat the last step until no more matches are found in the registry, then close the registry editor and reboot your PC
- Done - open GPU-Z and notice that ULPS will no longer be active
Basically ULPS, ultra low power state, can cause the second card to idle down into ULPS (ie. pretty much turn off) and that then causes problems when in crossfire configuration when windows tries to use that second card - which then ends with a BSOD/crash.
Disabling ULPS will ensure both cards are enabled and running as they should when in crossfire configuration.