OWC 8GB UPGRADE: Consists of a single 8GB DDR3L 1600 PC3L-12800 CL11 2Rx8 204-pin 1.35V SODIMM Memory RAM Module Upgrade memory module compatible with HP ProBook models 470 G0, 470 G1, 640 G1, 645 G1 And 645 G2. 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.