4GB KIT (2 x 2GB) For HP-Compaq HP Presario Desktop CQ5600F CQ5600Y CQ5602F CQ5603F CQ5604F CQ5619F CQ5621F CQ5624P CQ5625F CQ5705P CQ5725F SR2029ES SR2029FR SR2029SC SR2029UK SR2059ES SR2089ES SR2089NL S3905F SG3308LA SG3310LA SG3312LA SG3315LA SG3370AP SG3400CN SG3400CX SG3410IL SG3418BR SG3420CX SG3420TW SG3430IL SG3440IL SG3450IL SG3470IL SG3500CN SG3501RU SG3505LA SG3509LA SG3510TL. DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (2 x 2GB) DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP-Compaq HP Presario Desktop. (See Compatibility List Below)