1GB KIT 2x 512MB For Toshiba Satellite P Series P20-S203 P25-S477/P25-S487 P25-S507/P25-S508 P25-S509/P25-S5091 P25-S5092 P25-S5093 P25-S520/P25-S5201 SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory 1GB KIT (2 x 512MB) SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Toshiba Satellite P Series. (See Compatibility List Below)