I put it through its paces with my recent regulars, Starcraft 2 and TF2, and as expected it played well at max settings. Unexpectedly and happily it did this without the the fan changing noticeably; previously it sounded like it was preparing for liftoff.
Still, I felt only a hollow victory until I bought Fallout 3 GOTYE on Steam. I set everything to max, and once again, it plays flawlessly with hardly any fan spinup.
With a fairly current CPU and GPU, its clear now how much disk access is slowing things down. That's next on the hardware to-do list.