Well, I promised I'd return with news of how it runs on my pc:-
XP2000
512 2700 ddr
64mb GeForce 4 MX440
Well, I loaded it up, set everything to medium. In game I'm getting 35-42fps, which is pretty good, easily playable. So then I went back to Graphics config, quite happy (I was amazed really), and set everything to High. Oops.
So then I returned top game, getting horrible texture distortion....sand flickers black, if I turn quickly I get jagged textures mismatched all over the screen. Thing is it seems to be artefacts to me, but I'm not oc'ing, and so a bit confused!
Still had a steady 32fps tho

It isnt playable with these texture issues, I think its water related too. Any thoughts?
XP2000, 512 ddr 2700ram, GF4 MX440, XP Pro