These are Toshiba compatible modules that meet or exceed the specifications of your Notebook. We Guarantee 100% Compatibility with all of these modules. Compare prices and notice what you can save!! Kingston Part Numbers are used for reference only !! Toshiba Part# KTT533D2/256 256MB PC2-4200 DDR2 SO-DIMM $28.00 TOSHIBA Part# KTT3311/512 512MB PC2700 DDR 333MHz SO-DIMM $55.00 TOSHIBA Part# KTT3614/512 512MB PC2100 DDR 266MHz SO-DIMM $54.00 TOSHIBA Part# KTT3311A/1G 1GB PC2700 DDR 333MHz SO-DIMM $125.00 TOSHIBA Part# KTT3311/1G 1GB PC2700 DDR 333MHz SO-DIMM $125.00 TOSHIBA Part# KTT533D2/512 512MB PC2-4200 DDR2 533MHz SO-DIMM $55.00 TOSHIBA Part# KTT533D2/1G 1GB PC2-4200 DDR2 533MHz SO-DIMM $110.00 TOSHIBA Part# KTT-SO133/512 512MB PC133 SDRAM 133MHz SO-DIMM $75.00