I have had some installations with AMD workstations (on B7321,
B7331 and B7332), and they ran as well (or as bad...) as Intel
I positively know that Deployment Servers don't run on AMD chips
because of some hardware-dependent algorithms for the Installation
I've had some fat celeron 233 clients running for a couple of years with 64 meg of memory. obviously, you want more memory and processor speed if possible but for local clients it's not such a critical thing as long as you don't plan on development work on those PCs.
NT 4.0 SP5, SQL 7.0, One World B7321 SP12.4, Citrix 1.8 (XE soon)