well that's awfully good of MS, adding in extra requirements for a point release.... my AMD cpu doesn't support cmpxchg16b.... which is pretty much pointless from what I can tell (8TB user space...) for the average user.no, the requirements are not the same. windows 8.1 x64 needs your CPU to support CMPXCHG16b, PrefetchW and LAHF/SAHF.
Nothing like shafting users who actually supported windows 8 by not supporting cpu's that worked perfectly well with win 8 in 8.1
Might as well have stuck with windows 7...