I used a mini with the 950 in it until a few months ago. I never really had an issue with it, but I didn't play many games either. I did use final Cut Express on it without much trouble though.
I think the monitor is causing the problems. My resolution was in the 1280x1024 range, and it was pretty smooth. Obviously H264 HD content with stress the processor too much, but for general use it should be fine.
I think the monitor is causing the problems. My resolution was in the 1280x1024 range, and it was pretty smooth. Obviously H264 HD content with stress the processor too much, but for general use it should be fine.