You underestimate my power. that thing plays bioshock 2 on ultra settings, bad company 2 on ultra, and bf3 on high. Not to mention Minecraft. I get like 50fps on Minecraft with very far view. It's pretty dang fast.
At what resolution?
And thats BS man, my friend had an I3 530 overclocked to 4.2ghz and a 5750 both of which are worlds stronger than what you have and even at 1440x900 resolution everything on low he said it was laggy playing BF3. It wasn't until he upgraded to an I5 750 and 5850 that he could play at 1080p and even then he said FPS was in the 40's but no lag.
Even if you are at 1024x768, it's still BS with ''high'' settings. The 6450 has 160 stream processors and little to no memory bandwidth. The 5750 has 720 SP's and decent memory bandwidth, it destroys it in gaming.....not even a comparison.