I say go for it, you may havta turn everything to low and low res but it would definately worth it!
I bought OFP with a 355Mhz CPU (clocked at 298) 64MB Ram, and a crap video card... I could run it with lots of bugs glitches and texture errors and stuff, anyway when I upgraded OFP ruled
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"The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty." - Winston Churchill