I am looking at upgrading my computer to an 'i5' P55 Socket. My current specs are as follows

Q6600 Core Quad 2.40ghz (O.C. to 2.70ghz)
ASUS P5N-D Mobo nforce750 chipset
6GB 800mhz DDR2 RAM
ASUS 8800GTX 869mb GPU
600W PSU

And I want it to look something like the Following (with Slash's dividing the Options)

Intel Core i5 750 2.66Ghz (Quad Core)   /   Intel Core i5 661 3.33Ghz (Daul Core)
Asus P7P55D LE Intel P55 (Socket 1156) PCI-Express DDR3 Motherboard
4GB DDR3 1600mhz Ram    /    4GB DDR3 1333mhz RAM
ASUS 8800GTX 869mb GPU
600W PSU

I want to stay with my trusty 8800GTX GPU but I am unsure as to whether a 2.66ghz Quad core would be better than a 3.33ghz daul core. And because both chips say they can only support under 1333mhz DDR3 Ram, Would there be any point in going for 1600mhz RAM.


-Which CPU is best for FSX SP2 and Win7 64bit?

-Which should I choose?

-Will my 8800GTX be compatable with these Specs?

-Will 600W be enough for what I want?


Info: www.novatech.co.uk

Thanks

I don't think the Core i5 750 performance increase over the Q6600 warrants the price of upgrading. I'd probably overclock the Q6600 some more, should go to 3.0ghz on stock cooling, and 3.6ghz on improved cooling, maybe more, maybe less depending on your chip.

Thanks for your replys and thoughts,

I have already tried overclocking the cpu more and I just keep getting boot errors or system lock ups after 30mins or so. And I have already been on tomshardware website to try and resolve it but it seems i cannot go above 2.7 without problems.

The i5 would still have a faster speed than my q6600 and has lot of new features which come with it like turbo boost which will automaticlly overclock the quad core from 2.66ghz to 3.2ghz on one of its cores , and the daul core from 3.33ghz up to 3.6ghz. And DDR3 running at a faster speed must also make a difference.... surely it would still be an upgrade. 

but the biggest question would be whether I should go for the 3.33ghz daul core or 2.66ghz quad