Why without HT ?

I can't get wPrime to span multiple processor groups. So it's essentially limited to 64 threads in Windows - which is the max groupsize in Win7/2k8 and Win8. Still trying to figure it out but since Windows treats multiple processor groups as independent scheduling entities, it takes specific software code to make it work. I don't think wPrime will be able to handle it without code revisions. But as I said, still trying to figure it out.