That is the most hard core 2.3MHz CPU I have ever seen!

Anyway, yeah. GT330M is not exactly a high end card.

i7 at 2.7 GHz is probably not too far from your 2.5 i5 in per-core performance, and the i7 920 has 4 cores. I have a Q9450@3.2GHz myself (probably weaker than a 920@2.7), and I know that if I lower the graphics settings so that my GPU doesn't limit me anymore, I can easily do 60fps almost everywhere in the game.