You will get a hell of a lot better performance with 1GB RAM. P4 HT at least. t3 will also be the best, but t1 is a good start.If he's putting it in a cafe, he should not bother renting one from a hosting website.
His best bet is to host it on the same PC he is hosting the CAS application.
The server box should have 512MB-1GB of memory
a Pentium 4 or above (P3s work in a pinch)
and your internet speed should be a t1 or t3. (c'mon it's a gaming cafe)
Well it's interesting that someone here got a Cafe thing.