2GB STICK For HP-Compaq Pro Desktop Series 3300 3305 3310 3330 3330 3335 3340 3400 3405 3410 3410 3500 3505 3515 4000 4300 4500 6000 DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Brand 2GB STICK DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP-Compaq Pro Desktop Series. (See Compatibility List Below)