This is a Dell 16GB memory kit. Included are four 4GB SNPX1564C/4G DDR2 Memory Modules for a total of 16GB over 4-slots. This is PC2-5300 ECC REG Server Memory. Will work in Power Edge 1800 1850 2800 2850 6800 6850 SC1425 servers and many others that can use DDR2-667 240-pin ram. These units are tested and guaranteed working.