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greetings
you really need matched sets of memory for dual channel operation, buy them together....corsair has the twinx packs
most memory companies have a lifetime guarrantee, keep your packaging and documentation.
corsair, kingston crucial are my favorites
premium is better, ie: kingston hyperx..their worth the money
400 ddr is almost the same money now as 333, so why not...
personally, i would get 4 --512--pieces, other techs might say 2 -1 gigs...just my preference.
good luck
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