4GB STICK For HP-Compaq Elite Desktop Series 8200 (All-in-One) 8200 (Ultra-slim) 8300 (All-in-One) 8300 (Ultra-slim). SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. 4GB STICK SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP-Compaq Elite Desktop Series. (See Compatibility List Below)