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Also I can't actually find any specifications for UT2007, admittedly I didn't look very hard, but that may make it harder to decide. I'm sure someone knows the rough specs required for it however.
At a guess, I think you'd probably need a GF6 or equivalent or above, ~3Ghz CPU and about a gig of RAM.
I would think the GF6/equiv would be necessery, yes.
You *might* be able to run it with a few hundred mhz less processing power, from maybe like 2.5Ghz+, if you've got a high performance CPU like an Athlon or a Pentium or whatever. But if you've got an entry level CPU like a Celeron or a Sempron then you'll need all the mhz you can get.
The RAM, again, it *might* be playable with only 512 but who knows. You'd be safe with a gig.
I still have a geforce 4 :-s