I just got a new computer yesterday and my specs are:
Windows 7 64-bit
8192 MB RAM
Pentium Dual-Core CPU E6300 @ 2.80GHz (2 CPUs), ~2.3 GHz
NVIDIA GeForce GTX 275
My Windows Experience index is 6,3:
Gaming graphics: 7,4
Primary hard disc: 6,9
And I love this! It's so fantastic to see all the particles in the galaxy collissions being calculated to perfection at very high timesteps!
If I set the timestep to 10.000 years in the Andromeda-Milkyway collission, one real second is 400,000 years with 1x particles multiplier!