E6600 vs. Q6600 Any Difference right now?

On most of these current games that dont utilize multiple cores, is there a difference at all between the E6600 vs. the Q6600 or is it exactly the same with just two more cores? What I am asking is I currently have the E6600 and want to upgrade, but will I even notice a difference on these games by getting the Q6600?

Ok, so which option would be better? Should I get the E8600 at 3.3GHz or go with the Q6600 and overclock it to 3.3Ghz to equal performance? I do play FSX and it is core hungry, but I now know the Q6600 wouldn't make a difference on most games except FSX unless I overclock the Q6600 up to the specs of the E8600. Is this right or am I way off?

Correct me if I am wrong, the best option would be to get the Q6600 (Quad cores because of FSX) and immediately OC to 1333MHz 3.3Ghz for all other games? What do you think?

My Specs:
Core 2 http://en.wikipedia.org/wiki/Intel_Core_2 Duo E6600 2.4GHz
EVGA 8800GT Superclocked (Core 700, Mem http://en.wikipedia.org/wiki/Mem 975)
2GB Corssair XMS2 DDR2 800 (4-4-4-12)
700w OCZ http://en.wikipedia.org/wiki/OCZ_Technology GamerXStream PSU
eVGA 680i Mobo
320GB Hard drive 16MB cache 7200RPM
Windows XP

As for an answer to the thread name, yes there is difference. My friend has an e6600, and when I use his computer it is a lot less smooth when multiple applications are open, and even performs worse on certain games.

Any game needs a certain number of calculations per. second(AI, physics ect.). When you get above that, there is very little point in higher clockrate or more cores. The turning point seems to be around 2-2.4 ghz for dual cores for even the most demanding games at the moment(fsx being a possible exception). .