2600K helps a lot in 3Dmark. Your bluefire808's overall score is higher than my 680 +190/+450 (1337Mhz gpu boost) on 2500K @ 4.6. I bet your his graphics score is lower, but your his physics score inflates your his overall result. Try running your bench with HT disabled. We should really compare graphics score to eliminate CPU out of equation.
Edit: Oops, mistook you for another poster
here are the scores. what is HT and can you explain about disabling it? im curious as to this HT and what enabling and disabling it happens.
HT stands for HyperThreading. 2500K has 4 physical cores and no HT, 2600K has 4 physical cores and 4 "logical" cores, or "hyper threads". Because of that windows sees 2600K as CPU with 8 cores, and some software is able to use these addional "fake" cores to speed up calculations. 3Dmark one of these programs, which benefits from HT. You can disable it in BIOS.
These are my scores with 2500K @ 4.6 and 680 @ 1337 GPU max boost/6908 memory (+190/+450 offset):
You still have a bit of a higher graphics score, that's odd, what is your CPU clocks? But the point is - just look at physics score: your's is 40% better than mine, but our graphics scores are within 5% of each other. That's why overall 3DMark score is not really representative of graphics card's performance. If you want to compare your overclock's performance, it's better going off a graphics score.