Two 256 MB memory sticks, (512MB total) 533 MHz, 200 pin SODIMM laptop memory, dual channel, matched pair, OEM for Gateway laptop with pentium M processor and 915 chipset, Samsung part # M470T3354CZ3-CD5, details: 256MB 1Rx16 PC2-4200s-444-12-C3. Works great, have upgraded to more memory. Good as backup or checking if you memory is suspect. $8 , Chuck, phone for faster response, leave message if no answer. 9am to 9pm every day. Located in Bright's Grove.