Well this maybe the issue I am seeing with the new 7970 I just got. I run Rift at 2560x1600 at medium on my main monitor and the slaves are running on two secondary monitors in software render mode. When use AMD system monitor to measure the GPU usage I am getting max of 80% YET my frames are only around 30fps dropping as low as 15 fps in Meridan. The 7970 is a 3gb card but I wonder how much memory it is using and if the frame buffer is a bottle neck.