OWC 8GB UPGRADE: Consists of a single 8GB DDR3 1600 PC3-12800 CL11 2Rx8 240-pin 1.5V Non-ECC Unbuffered DIMM Memory RAM Module Upgrade memory module compatible with HP ProDesk models 400 G1 SFF, 400 G1 Tower, 400 G2 Tower, 405 G1 Tower And 490 G1 Tower. 100% COMPLIANT: JEDEC-Standard and ROHS Compliant. Warranty-Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs. INCREASED PERFORMANCE: Memory Upgrades are the Most Effective and Easy Way to Boost your PC's Performance. INDUSTRY LEADING: Consumer-friendly Advanced Replacement Program and Limited Lifetime Warranty, which includes Free Tech Support by Other World Computing. EASY INSTALLATION: In Most Cases, Installing Memory is an Easy DIY project. Watch our OWC Basic Installation Video for Help.