4GB Kit 2 X 2GB DDR2 Memory for Dell Precision Workstation 380 390 T3400 PC2-5300 240 pin 667MHz NON-ECC DIMM RAM (PARTS-QUICK BRAND) Speed: PC2 5300 667MHz Form Factor: 240 pin DIMM Capacity: 4GB Kit 2 x 2GB Warranty: Lifetime