DDR2 1GB 1,DDR2 RAM 800mhz 2GB 2,128MB/256MB/512MB/1G/2G 3, ... Desktop Computer,laptop computer 4,128MB/256MB/512MB/1G/2G DDR2 1GB specification: 1) DDR 400/333 & DDRII 533/667/800 MHz2 ... 24) 2 variations of refresh25) Auto refresh 26) Self refresh DDR2 1GB