1Rx8 PC2 6400U -666-12 upgrade Tags: Memory DDR2 Last response: March 7, 2013 2:18 PM in Memory Share shadowizoo March 7, 2013 12:18:15 PM I got 2 sticks of 1GB 1Rx8 PC2-6400U-666-12-Do and I would like to upgrade. Can I put any kind of memory? If no, which memory should I put inside? I saw this "GB Micro 2GB DDR2 PC6400 800MHz Memory" on staples, is it fine? More about : 1rx8 pc2 6400u 666 upgrade cin19 a b } Memory March 7, 2013 2:18:32 PM What kind pc do you have? No all the PC can support 2GB RAM in each ram slot, so check the PC or motherboard manufacturer for the detial. Or post it here we can check for you too. Can't find your answer ? Ask ! Publish Related resources : ForumASRock 775Dual-VSTA - DDR2 PC2 5300 or 5400? [UPGRADING] ForumUpgrading from PC2 3200 to PC2 4200 More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !