I7 Processors use socket LGA775.
Pentium Pro
939
Socket 370 was used by the last of the Pentium IIIs, their corresponding low-end equivalent Celerons, and certain VIA processors.
Socket 7LGA775 socket
Socket 1366 Socket 1156 Socket 1155 Socket LGA 2011 are in use presently
Some Cpu's that use Socket A are Athlon Xp, Athlon Mp, Athlon Model 4 AMD's Athlons and Duron use Socket A, also known as Socket 462. The AMD Athlon and the AMD Duron use a 426-pin socket called Socket A. The Athlon Thunderbird
The Socket AM3 Connector is compatible with the AM3 and AM3+ processors, but not AM2 or AM2+ processors, which have 940 pins instead of the 941 pins of the AM3/AM3+.
Intel Xeon Processors
CPU socket 939 was released by AMD in 2004, it supports both single and dual core processors. Socket 939 supersedes socket 754 for Anthlon 64 processors, it is no longer in production.
In computer hardware, a socket type is the designated type of slot where other cards and processors will fit into. Some socket types include PCI, ISA and PCI-express. A common socket type for processors is the LGA 775.
CPU slot(s) and/or socket(s)The type of CPU slot or socket determines which processors the motherboard can use. The most popular CPU connectors are Socket 370 (late-model Intel Pentium III and Celeron processors), Socket A (AMD Athlon and Duron), Socket 478 (current Celeron and Pentium 4), Socket 423 (old-style Pentium 4), Slot 1 (old-style Pentium II/III and Celeron), Slot A (older-style Athlon), and the obsolete Socket 7 (Intel Pentium and AMD K6-* processors). Some motherboards have two or more CPU connectors, allowing them to support multiple processors. A few motherboards have both Slot 1 and Socket 370 connectors, allowing them to support either type of CPU (but not both at once).There are three versions of Socket 370, which differ in pinouts and which processors they support. Early Socket 370/PPGA motherboards support only older Mendocino-core Celeron processors. Later Socket 370/FC-PGA motherboards support Coppermine-core Pentium III FC-PGA processors and Coppermine128-core Celeron FC-PGA processors. The final Socket 370 motherboards, which Intel refers to as "Universal" models, support any Socket 370 processor, including Tualatin-core Pentium III and Celeron processors. Although Socket 370 is now obsolescent, tens of millions of Socket 370 systems remain in use. When you upgrade such a system it is important to check the documentation to determine which Socket 370 variant that system uses.