With any XWindows setup you are going to want a somewhat powerful CPU, 128MB of RAM, and an 8MB video card. I think a 500Mhz pentium 2 will do the job. I can run X windows on my old 300 Mhz K6-2 with 128MB ram and a 16MB voodoo3. It does run a little slow though. I am sure a pentium 2 should have no problems.