You would be able to use the GPU Folding client to utilize the IGP, but there is no PhysX on ATI product (yet). There was rumor someone was working on porting it, but that's vaporware or what I think is more of a lame attempt at getting some free hardware. AMD is working with Intel and Havok for Havok physics acceleration, however there hasn't been any news at all about that in ages. Other than that, the IGP is only useful if you're using Hybrid Crossfire (again, limited to lower end 3400-series cards), Hybrid Power (nice power savings solution), or SurroundView/Hydravision multimonitor support - if you have need for more than 2 monitors running.