A-TECH 1GB KIT (2 x 512MB) For Dell Optiplex 170L/170LN GX270 (SD/SMT) GX270 (SF) SX270. DIMM DDR NON-ECC PC3200 400MHz RAM Memory. Genuine Brand. 1GB KIT (2 x 512MB) DIMM DDR NON-ECC PC3200 400MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Optiplex. (See Compatibility List Below)