A-TECH 4GB KIT (2 x 2GB) For Toshiba Satellite P Series P105-S921 P105-S9312 P105-S9337 P105-S9339 P105-S9722 P105-SP6022 P105-SP921. SO-DIMM DDR2 NON-ECC PC2-4200 533MHz RAM Memory. Genuine Brand. 4GB KIT (2 x 2GB) SO-DIMM DDR2 NON-ECC PC2-4200 533MHz 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)