ALT-TAB disables Crossfire

smurf-oly · #1 10-11-2011, 01:43 PM

I normally get good Crossfire performance in CloD (including the Steam release (1.02) and the current beta 2 patch (15866) with core patch (1.04).

However, if I ALT-TAB out of the game, and then return to it, Crossfire is functionally disabled with fps dropping by half and utilization of the second card showing a drop... see attached images. I don't have this experience in any other games or applications.

The only way I have found to remedy this is to restart Windows... restarting the game does not help.

310thDiablo · #2 10-11-2011, 01:50 PM

what program are you using to monitor with?

smurf-oly · #3 10-11-2011, 05:03 PM

MSI Afterburner

310thDiablo · #4 10-11-2011, 06:08 PM

thanks

310thDiablo · #5 10-12-2011, 02:19 AM

Smurf...how are you forcing your cards to run at 99%? Mine are only showing at like 50% or less.

smurf-oly · #6 10-12-2011, 11:43 PM

Well... I'm not doing anything special I know of. The difference may be the video cards you have, your CPU and/or the video settings you are using.

I'm using maxed out video settings with a resolution of 1920x1080 and, by today's standards, rather weak HD5850s. If you have newer and better cards (6950, 6970, etc) and/or are running lower video settings you may not be pushing your cards.

Also, I have noticed what I believe to be my CPU (or maybe RAM) bottle-necking things (when lots of activity, lots of other planes in the air) as my framerates will drop and at the same time my GPU utilization will also drop (which I presume to be because the CPU is not delivering fast enough).