2GB KIT (2 x 1GB) For Dell Optiplex Series 160L GX260 GX60 L60 L60 P4 SX260. DIMM DDR NON-ECC PC2100 266MHz RAM Memory. Genuine A-Tech Brand. 2GB KIT (2 x 1GB) DIMM DDR NON-ECC PC2100 266MHz 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)