Socket M (mPGA478MT) was used in all Intel Core products, as well as the Core-derived Dual-Core Xeon codenamed Sossaman. It was also used in the first generation of the mobile version of Intel's Core 2 Duo, specifically, the T5x00 and T7x00 Merom lines (referred to as Napa Refresh), though that line switched to Socket P (Santa Rosa) in 2007. It uses the Intel 945PM/945GM chipsets which support up to 667MHz FSB and the Intel PM965/GM965 which allows 800MHz FSB support.