4GB KIT 4x 1GB HP-Compaq Business dc5800 dc5850 dc7700 dc7700 dc7800 dc7900 dx2355 dx2358 dx2400 dx2450 dx2480 dx2700 dx2710 dx2718 dx2810 dx7300 dx7380 dx7400 DIMM DDR2 NON-ECC 6400 800MHz RAM Memory 4GB KIT (4 x 1GB) 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 HP-Compaq Business Desktop Series. (See Compatibility List Below)