A-TECH 4GB KIT (4 x 1GB) For Dell Precision Workstation 450N 650N. DIMM DDR NON-ECC PC2100 266MHz RAM Memory. Genuine Brand. 4GB KIT (4 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 Precision Workstation. (See Compatibility List Below)