Socket J

CPU socket
name = Socket J (LGA 771)


formfactors = Flip chip land grid array | contacts = 771
type = LGA
protocol =
fsb = 667 MT/s, 1066 MT/s, 1333 MT/s, 1600 MT/s
voltage =
processors = Intel Dual-Core Xeon 5xxx
Intel Quad-Core Xeon E/X5xxx

Intel Core 2 Extreme QX9775

Socket J, also known as "LGA 771", is a CPU interface introduced by Intel in 2006. It is used in Intel's most recent DP-capable server processors, the Dual-Core Xeons codenamed "Dempsey" and "Woodcrest" and the Quad-Core Clovertown, as well as the new generation of Core 2 Extreme processors. The word "socket" is now a misnomer, because an LGA771 motherboard has no socket holes; instead, it has 771 protruding pins which touch contact points on the underside of the processor (CPU).

As its name implies, it is a land grid array with 771 contacts. The "J" in "Socket J" refers to the now-cancelled processor codenamed "Jayhawk", which was expected to debut alongside this interface. It is intended as a successor to Socket 604 and takes much of its design from LGA 775.