I have 7068 x86 on a Dell Inspiron 5150. 3ghz cpu, 2gb ram, and an ATI Radeon Mobility 9000 GPU. It runs decent enough, but there are no supported drivers that I could find for the GPU, so Aero does not function at all.
I also have a computer with an AMD 1600+ CPU, 1gb of Memory and an Nvidia Geforce 5900 256mb GPU that I will be loading W7 x86 on tomorrow to see how it runs.