This is an 8GB kit of two 4GB DDR2 ECC Fully Buffered RAM modules with a frequency of 667MHz. It is designed for use in various computer brands such as Dell, HP-Compaq, Apple, Intel, IBM-Lenovo, Toshiba, Acer, Asus, and Sony. The RAM features ECC memory and is fully buffered. It has a lifetime manufacturer warranty and is made in the United States.