8GB KIT (4 x 2GB) Dell Optiplex 740 745c 755 DT/MT / SFF 760 DT/MT / SFF 760 Series (Desktop Mini Tower and Small Form Factor) DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory Genuine A-Tech Brand 8GB KIT (4 x 2GB) DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Optiplex. (See Compatibility List Below)