16GB KIT (2 x 8GB) For Dell Precision Notebook Series Mobile Workstation M4500 Mobile Workstation M4500 (Quad Core) Mobile Workstation M4600 Mobile Workstation M6500 Mobile Workstation M6500 (Quad Core) Mobile Workstation M6600 (2 Slots) Mobile Workstation M6600 (4 Slots). SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. 16GB KIT (2 x 8GB) SO-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 Dell Precision Notebook Series. (See Compatibility List Below)