Benchmark increase but no real-world increase?

I overclocked my 3200+ to 2.5Ghz. I have Corsair Valueselect so I'm using a 6"5 divider. I'm also running with a 4x LDT multiplier. Anywayz, I have 1GB of the memory and a 6600GT.

OK, straight to the point, Sandra tells me I'm running better than a 3.8GHz P4 570. Thats the good part. Now for the bad part. Before overclocking, 3DMark05 was giving a score of ~3200. After overclocking, my score increased to ~3500. Thats only a 300 point score increase.

I'm wondering, shouldn't the increase in performance a more than this? Or is something with my hardware bottlenecking, like my video card? Because after getting the 6600GT, my 3DMark03 score doubled. If my computer is running better than a FX-53 and better than a 3.8Ghz P4, shouldn't it be performing better?

3d03 and 05 are more video card dependent. Cpu speed increases make small steps in these benchmarks. 3d mark 01 or aquamark are more of a total system test if you want to see that.

3DMark05 taxes your videocard much more then does sandra. If you want to achieve high 3DMark05 scores, then you gotta upgrade videocards.... rather then uping the clock on your cpu.

a 300 point increase in 3dmark05 is a big increase just for clockin your CPU quicker. I'm surprised you got that much. If you want more, overclock your video card. It wouldn't be hard to get to 4000 with that card. I have gotten over 4,000 with my 6600GT, and my cpu is slower.

yeah 3d2003 and 3d2005 are video based benchmark
try 3d2001 and u see a deferance

So, even though i'm getting low scores in gaming benchmarks, should my performance in actual games be increased?

those aren't low scores, those are average if not better than average for your equipment. And yes, you should see more FPS in games by having a quicker CPU.

This is the increase I get when all I do is overclock the CPU from 2.0GHz to 2.5GHz.

BEFORE Overclocking.
SuperPi - 41s
3DMark01SE - 18, 524
Sandra - 8431 MIPS, 3165 MFLOPS, 4095 MFLOPS.
3DMark03 - 8016.
3DMark05 - 3378.

AFTER Overclocking.
SuperPi - 36s.
3DMark01SE - 20, 370
Sandra - 10,486 MIPS, 3937 MFLOPS, 5098 MFLOPS.
3DMark03 - 8281.
3DMark05 - 3434.

yep, looks right. The main one there to show how much faster your CPU is getting, is the superpi.
Now if you want better performance in games, overclock your video card.

Ok, thanks.