1GB STICK For HP-Compaq HP Presario Desktop SR5615CF SR5616F SR5617ES SR5617FR SR5618CF SR5618CX SR5618ES SR5618F SR5619DE (Intel G31) SR5619DE (Intel G33) SR5619ES SR5620AN SR5621AF SR5621BE SR5621CH SR5621DE SR5621IT SR5621PT SR5621SC SR5622DE SR5622IT SR5622NL SR5622SC SR5622UK SR5625FR SR5625LA SR5630CN SR5631NL SR5632FR SR5632IT SR5632PT SR5633DE SR5633WM SR5634DE SR5635CX SR5635ES. DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 1GB STICK 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)