At what point does Memory performance drop off?

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I have an E6600 dual core (2.4 Ghz) that I was running with 2 Gigs of memory.

I'm ordering a new MoBo off newegg, so I figure I might as well get some more memory.

I was wondering whether to get another 2 gigs so i'll have 4 total, or even another 4 gigs so i'll have 6 total. But at what point is it overkill with this CPU?

 

[bomberboysk]

either run 2,4, or 8gb. 6gb will remove dual channel. Anything above 8gb you wont really notice unless running alot of CAD/photoshop kinds of things. remember the 32bit 4gb limitation though.

 

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So it would be faster to have 2 sticks of 2GB DDR2 @ 1066 than that plus 2 sticks of 1GB 677?

 

[bomberboysk]

So it would be faster to have 2 sticks of 2GB DDR2 @ 1066 than that plus 2 sticks of 1GB 677?

Yes, because you would 1- lose dual channel, and 2- have to run all memory at 667mhz. Sell the 667mhz on craigslist for $15-20 or put it in an older system or something

 

[pause]

ahhh I see.

thanks