512MB STICK For HP-Compaq Pavilion Series ze4312AP ze4313 ze4314 ze4314AP ze4315 ze4315AP ze4315CA ze4315US ze4316 ze4316AP ze4317 ze4317EA ze4318AP ze4318EA ze4318US ze4319 ze4320EA ze4321 ze4321EA ze4322EA ze4323EA ze4325CA ze4325EA ze4325US ze4326 ze4328US ze4332EA ze4333EA ze4334EA ze4335EA ze4335US ze4336EA ze4337EA ze4345EA ze4345EA (DDR) ze4345US ze4347EA ze4348AE ze4348EA. SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory. Genuine A-Tech Brand. 512MB STICK SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP-Compaq Pavilion Series. (See Compatibility List Below)