A-TECH 2GB STICK For HP Compaq DC Series Desktop dc5750 dc7800 Convertible Minitower Small Form Factor dc7900. DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory. Genuine Brand. 2GB STICK DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP Compaq DC Series Desktop. (See Compatibility List Below)