1GB STICK For Dell Optiplex Series 160 330 360 740 (Desktop and Mini-Tower) 745 (Desktop MiniTower Small Form Factor) 755 (Desktop Mini-Tower Small Form Factor) 760 (Desktop Mini-Tower Small Form Factor) 760 (Ultra Small Form Factor) 960 960D FX160 GX280 (Desktop and Mini-Tower) GX280 (Small Form Factor) GX620 (Desktop Mini-Tower Small Form Factor) GX620 (UltraSmall Form Factor) GX960. DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 1GB STICK 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 Series. (See Compatibility List Below)