Best DDR2 Choice

[kppanic]

I have a choice between:

Corsair XMS2 Dominator TWIN2X4096-8500C5DF Matched Pairs 4GB Kit (2x2GB) PC8500 DDR2-1066 CL 5-5-5-15 240-pin Dual Channel DHX Memory w/ Fan

and

Corsair XMS2 TWIN2X4096-6400C5DHX Matched Pairs 4GB Kit (2x2GB) PC6400 DDR2-800 CL 5-5-5-18 240-pin Dual Channel DHX Memory

for about same price,

to be fitted onto a Gigabyte GA-P35-DS3L with a Q6600, maybe OC'd to 3GHz.

Which memory sticks would be better?

Thanks

 

[kppanic]

Thanks for the reply.

What about:
Corsair XMS2 DHX TWIN2X4096-6400C5DHX 4GB DDR2 2X2GB PC2-6400 DDR2-800 CL 5-5-5-18 240PIN Memory Kit

vs

Corsair XMS2 DHX TWIN2X4096-6400C4DHX 4GB DDR2 2X2GB PC2-6400 DDR2-800 CL 4-4-4-12 240PIN Memory Kit

the only difference that i can see are the timings, prices are the same.
I understand the 6400's are the best for Q6600 OC'ing as they love the FSB.

** Memory is very very confusing!! Where can I go read more about this stuff? I read the stickies but i'm just blown out of my mind **

 

[kppanic]

Thanks tons for an awesome reply =)