The drivers for Nvidia cards have fluctuated in efficiency over the last few WHQL releases. Another release is due out that should help with leveraging more of the power of your GPU.
There is a significant difference in the performance of the newer GPUs depending on the CUDA Cores (in the case of Nvidia), more so than dedicated memory.
Although it seems counter-intuitive, the Senior users here have found that in MOST cases, turning OFF (unchecking) the hardware acceleration (HA) settings in "preferences" utilizes the GPU better....not sure why, but this has ALWAYS been the case for me.
Now that SVRT is starting to work (in recent PD10 builds), this MAY change...but for now, I suggest you turn HA OFF if you have a strong video card! Hope this helps.
This message was edited 2 times. Last update was at Nov 21. 2011 15:41