That's about the same speed mine is running at, I don't think a 2.0-2.4 can handle it so easily. on that note... did you make sure to enable NATIVE on gsdx?
another quick note: the game runs wierd before you play as Vaad, so if you're commenting about that area ignore it, Recks opening area is really slow for some reason.. (I get 7-12 fps in there sometimes)