My son has asked me to upgrade the Ram in his P.C. It is used mainly for gaming and has currently 512 of RAM. I intend to add 1GB. Does it matter wether I add 2 x 512 or a single 1GB stick. I was told 2 x 512 in dual mode was better but does this only apply to pairs in which case I would need 2 pair of 512 and would need to buy 3 sticks not the 2 stick I was considering.
Thanks,
John.

its best to get paired RAM together if you want dual channel to work without a hitch. I'd suggest you sell the 512 stick and get 2x512 sticks from the same manufacturer.

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