depends on what games you want to install. most games run on far less than the fastest cpu.
I have a duron 900 in mine and it runs most things pretty good, with the exception of narc, mk3, tekken, and some newer games.
Using the original monitor could be a problem though, you usually need a special video card from waht i remeber. but then again you should talk to mcclain hes built a couple and ive only built one
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