Originally posted by ILuvDetailing
Microsoft's 64bit OS (Longhorn) doesn't come out until 2006 so there's no need to upgrade to a 64bit proc just yet.
but as PK said, the AMD64 claims that it can increase / optimize the performance of 32-bit apps & OS.

if longhorn is already 64-bit, can we run it on 32-bit CPUs? or is this an OS designed specifically for 64-bit CPUs?