Yes - synchronize similar GPUs is unchecked. I have Catalyst 11.8, MSI Afterburner, and Trixx 2.0 installed.
I was able to tilt the large fan down towards the cards and get the temps down to the low 70's, so I bumped up the core frequencies a bit, but I would still like to be able to lower the memory clock.
So from my past experience when I install Trixx on it's own it's not able to modify anything. I just reinstalled a Win7 rig with a single card last night and cannot get Trixx to control the card. When I launch MSI afterburner and then Trixx I am able to control everything with Trixx.
When I went from 2 cards directly plugged in to 4 cards on risers on this 790FXA-GD70 board I lost all ability to memory clock (I'm assuming because the MSI afterburner driver crashes at boot). I can control the core frequencies and fan speed, just not the memory clock