Upgrade to newer RAM for old Motherboard

Philippines
June 30, 2008 6:20am CST
I have a question, can I install 1GB PC400 RAM to PC2100 socket, cuz I want my old PC to upgrade it's RAM to 1GB or 512MB but I couldn't find any PC2100 RAM in stores, so will PC400 will work without prob to PC2100 socket to my old PC? I just need to upgrade this old PC to continue it's use for just non-extensive purposes without buying new PC, I just got new one....
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