Which is better?

2x 2GB. Gives you more room for expansion, lower power consumption and some motherboards / processors like 2 sticks better than 4.
 
2 x 2Gig definately the best IMO...but if I could afford 4gig of ram I wouldn't really care if it was 4 sticks or 2.
 
id say generally 2 X 2Gb but i find that in the uk 2 X 2Gb tends to be more expensive than 4 X 1 Gb,

so usually i would probably get 4 X 1 Gb but thats coz im cheap :)
 
2 x 4 is 8
some mobos have capacity for 16 but i aint never seen any 4gb dimms

otherwise yes 2x2 is good
 
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