I have to disagree on the ram issue. I am running SH4 on a machine WAY below the minimum specs - and I run it fine. Although I don't know it 512 would be enough.
My machine is a 1.5Ghz AMD (below minimum spec of 2GHz), 768Megs of Ram (below minimum of 1Gig) and a ATI 9800 Pro (that meets recommended specs). My rig runs fine - on mid level detail at that. Only time I have performance issues is when I go above 2k time compression or when a torp hits - then I get a couple of seconds pause. Granted - OS tweaking helps a bit also.
With the specs you gave - the question is what is the chip on your ATI card? If its 9600 or above - you should be set with it. I dont know how it would run on half a gig of memory - expect long load times (which I have as well) - but if its able to swap enough info it should work. You may see some performance issues - but it would likely run.
Good hunting - in either pond!
Captain Haplo
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