Intel GMA of course, but this is slow only because of driver problems. This is a whole new architecture. It supports everything in hardware, but the current drivers only have software support.
I turned one core of the CPU off (for this game) and I saw some performance issues. It seems that the software rendering and physics are done in both cores. This is only because the video chip only currently supports software rendering. However, I heard that for people who have video CARDs (high end though), they will see some performance improvements when one core of the CPU is made idle (i.e setting processor affinity to only one core, in task manager)
No second hand good stuff

If I could find some, I would already have bought them no?