you mean - two gigs. Ram only goes by: 256mb, 512mb, 1gb, 2gb. Double check that your computer use DDR or DDR2, cause it's not backward compatible. why you could still buy 1gb, 512mb and 256 mb... (doesnt work on any motherboard) first check howmany mb your motherbord can work on... i crashed my pc by just adding 512mb...