CF 4850 setup & no increase (2nd card clock stuck?)

I'm running two instance of the newest GPU-Z in Vista 64 and I'm noticing that even though my system correctly detects two 4850s (Device Manager and CCC see the pair) only 1 4850 seems to be used during full screen gaming/benchmarking. I'm using the CAT Hotfix drivers and I also used Driver Sweeper to install them.

For instance both cards sit at a clock of 500 at idle in Vista. I'll fire something up (3DMark Vantage, AoC, HGL, etc.) and when I exit after a few minutes to check the GPU-Z log I notice that only one card will have jumped up to 625. The other card might show one or two spikes to 625 for a second but essentially remains at 500 the whole time.

http://www.thedigitalfoundry.com/cfwtf.jpg

Also, now everytime I reboot CCC pops up the Crossfire detect, etc. dialog box. :confused:

What's going on? Thanks!

i personally don't run GPU-Z while doing tests because i've had issues with monitoring programs affecting CrossFire in the past. sorry i can't help.