Bizman, back in AH2, AMD dual core CPU processors mostly ran AH2 just using one core, with a select few dual core AMD processors using both cores
As time moved forward, and quad core CPU processors began showing up more and more of AMD processors became capable of being able to use 2 cores, although there was still a few that were not able to
I would have to go back and research for dates/year , but it has been several years now that every AMD processor I installed on a MB (computer build) for people, that 2 cores were being used in AH....now I can not be certain that every single processor/MB combination will work this way on AMD builds, but it has been since Windows 7 SP 1 was released that I have seen or heard of an AMD dual core or more cores not being able to use 2 cores
Hope this helps....maybe Skuzzy has better information with out me having to go back and research...got to get ready for doctors appointment at 8:00am...
TC