4GB KIT (2 x 2GB) For Gateway DX Series DX4200-06M DX4200-07e DX4200-09 DX4200-11 DX4300 DX4300-01 DX4300-01u DX4300-03 DX4300-11 DX4300-15e DX4300-17 DX4300-19 DX4300-21 DX4300-22 DX4710-05 DX4710-07 DX4710-09 DX4720 DX4720-03. DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (2 x 2GB) 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 Gateway DX Series. (See Compatibility List Below)