I recently switched to AMD and an eyefinity setup and had a few issues I had questions about. After 10 years of triple head usage, the last 3 using Surround I have never encountered so many issues as eyefinity over the past couple days.
Monitor position, resolution and ID#:
This is my big concern. It causes a lot of frustration and time wasted reconfiguring everything.
I am running a 3+1 setup, I have also tried 3+2 with the +1/+2 being above the Eyefinity monitors.
When I alt tab from games, my additional non-Eyefinity monitors get moved from above, to the left and if I have a TV hooked up via HDMI, both those additional monitors have their resolution changed. I need to be able to alt-tab and not have the monitors re-size the resolution. It would be nice if they also didn't get repositioned to the left.
A similar thing happens when my monitors go to sleep. Sometimes the +1 or +2 monitors do not come back depending on if Eyefinity was enabled and monitor IDs also changes (so matrox powerdesk ceases to function, I tried AMDs hydravision but was not happy with the way it works and it seemed to keep getting disabled). In addition to that the fans go to 50% speed which is quite audible. Since installing 2nd 7970 this is unbearably loud. I have to either reboot or load up MSI afterburner to reset the fan speed. I uninstalled MSI AB thinking it was trying to load a profile, but the fans still ramp up to 50% at idle when going to and coming out of sleep.
On top of that, coming in and out of eyefinity clones all my desktops and moves all my window locations/sizes. It seems with eyefinity vs TH2G or Surround I have to spend a lot of time wiith this.
Idle power usage, voltage and clock control:
When I have more than 1 monitor enabled, I see ~140 watts at idle (even with just 1 7970 installed). With one monitor I see about 80 watts at idle. Surprisingly, with 2 7970s I see similar numbers as 1.
With multi-mons the card sits at about 50C, 500mhz or 925mhz and .9 or 1.175v instead of 30C at 300mhz and .8v with a single monitor.
With more than 1 monitor this is more power usage than 2 GTX275s that have no power saving features, just 2d and 3d clocks.
With ULPS disabled the system is around 100 watts with 1 monitor, ~140 with >1.
Is there a way to force 2 clocks on a 7970 with multiple monitors?
When I have ULPS enabled, I cannot adjust the clocks/voltages in crossfire. MSI Afterburner also bugs out and can't see all the sensor data (HWInfo however seems to still function), or displays 0's. I found that I have to re-launch MSI AB to re-read the sensors and show correct values again. This isn't a game breaking bug and probably more to do with how AB was programed and how it interacts with drivers, but it would be nice to load up my 20% OC settings in crossfire and be able to use MSI afterburner without constantly having to re-launch it with ULPS enabled to save some power.