Windows 7 to scale to 256 processors

Back in 1996, OS/2 (the unloved stepchild of Microsoft and IBM) could scale to 64 processors. I believe it was actually higher than that, but IBM would only certify it as 64 CPUs because that was what they'd done the testing on.

http://www.redbooks.ibm.com/redbooks/pdfs/sg245393.pdf

256 cores ought to be enough for anybody.

Minimum requirements eh?

Damn, I was really hoping for a 257 core machine.

Jokes aside, a 64-core Larrabee (should it exist) would have 256 threads. A two-socket Larrabee system would have 512.

does anyone have experience with windows based HPC? Seems like this is an area where *nix has long dominated.