I got this to work in 12.4 with 3x 7970s...
All I had to do was use dummy plugs:) It has to be some glitch with power saving mode...
I just confirmed with one of my 4x7970 rigs that version 12.4 with more than one 7970 requires a dummy plug to resolve this issue. I had a few lying around and thought i'd recreate the issue described here.
fuck yeah:) thanks for the confirm! feel like a pro now!
also i noticed that you have to keep a monitor on so it wont go to sleep... i have on old CRT on all the time now with my 3x 7970s.
Did you try using a plug after you disconnected the monitor?
nope, but that is a great idea. i will give it a try.
what i did before was just turn it off.
Why bother with the plugs. There's no performance gain with 12.4 over 12.3
I suggest you uninstall 12.4 and install 12.3. You can use the uninstall program. You don't need to erase everything and install 12.3. It took me 5 mins to do it.