Please keep in mind that we're talking older software on newer hardware here. The amd64 (x86-64) platform came to desktops with the AMD Athlon 64, which gave the Pentium 4 a run for the money. Only some later versions of the P4 were 64 bit capable.
Point is, if you're running a 64 bit system, you should have plenty of power to run a modern desktop environment. I suspect mostly diehard IceWM veterans, who don't mind a few quirks, will be interested in this setup. My salutations!