The LGA 775 is a format for both motherboards and CPUs. It was designed by Intel for use with their processors. Motherboards and processors conforming to the LGA 775 standard follow a number of specifications. As of April 2011, both motherboards and CPUs following this standard can still be purchased at retailers.
LGA 775 Socket Basics
LGA 775 is a socket format for Intel processors. It is also known as "Socket T," and "LGA775." It replaces the older Intel Socket 478. LGA 775 sockets are used for Intel Pentium 4, Core 2 Quad and Core 2 Extreme processor families. The "LGA" in the name means "Land Grid Array." This refers to the physical layout of processors conforming to this standard. LGA 775 processors is unlike earlier sockets in that it lacks pin holes. Rather, LGA 775 sockets are arranged with 775 contacts in a 33 by 30 grid with a 15 by 14 area in the center without contacts. One corner contact as well as four contacts on two sides are also removed.
LGA 775 Socket Specifications and Attributes
Motherboard sockets conforming to the LGA 775 standard must measure 1.48 inches by 1.48 inches. In comparison with the previous Socket 478, this is a fifteen percent increase in size. There is also a 60 percent increase in the number of contacts. Contact density on the LGA 775 is achieved by placing the contacts much closer together than on previous sockets. LGA 775 sockets, despite having this higher density, also have lower resistance than previous sockets, resulting in an overall reduction of heat generated within the socket and its contacts.
LGA 775 Processor Basics
Intel processors intended to be used with the LGA 775 format have a number of features. Pentium 4 processors support "Hyper-Threading Technology," wherein a single processor can act as though it has two logical processors. CPUs using this format also support both SSE2 and SSE3, providing a suite of enhancements for better performance of 3D applications such as video games. They also use the Intel NetBurst microarchitecture Front Side Bus with Source Synchronous Transfer, allowing faster data transfer. Processors using this format also have Intel's Execute Disable Bit capability. This provides protection against some viruses and worms that attempt to exploit certain vulnerabilities in the memory buffer overrun.
Supported Processor List
There are a number of processors formatted to use the LGA 775 socket. These include the Celeron 400 series operating at 1.6 to 2.2 GHz, the Celeron D operating at 2.4 to 3.6 GHz, the Celeron Dual Core operationg at 1.6 to 2.6 GHz, the Core 2 Duo operating at 1.8 to 3.33 GHz, the Core 2 Extreme operating at 2.66 to 3.2 GHz, the Core 2 Quad operating at 2.4 to 3 GHz, the Pentium 4 operating at 2.66 to 3.8 GHz, the Pentium 4 Extreme Edition operating at 3.2 to 3.73 GHz, the Pentium D operating at 2.66 to 3.6 GHz, the Pentium Duel Core desktop operating at 1.6 to 3.06 GHz, the Pentium Extreme Edition operating at 3.2 to 3.73 GHz and the Xeon 3000 series operating at 1.86 to 3.16 GHz.
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