ⓘ Socket T. LGA 775, also known as Socket T, is an Intel desktop CPU socket. LGA stands for land grid array. Unlike earlier common CPU sockets, such as its predec ..

                                     

ⓘ Socket T

LGA 775, also known as Socket T, is an Intel desktop CPU socket. LGA stands for land grid array. Unlike earlier common CPU sockets, such as its predecessor Socket 478, the LGA 775 has no socket holes; instead, it has 775 protruding pins which touch contact points on the underside of the processor.

The socket had an unusually long life span, lasting 7 years until the last processors supporting it ceased production in 2011.

The socket was superseded by the LGA 1156 Socket H and LGA 1366 Socket B sockets.

                                     

1. Heatsink

For LGA 775, the distance between the screw-holes for the heatsink is 72 mm. Such heatsinks are not interchangeable with heatsinks for sockets that have a distance of 75 mm, such as LGA 1156, 1155, 1150, 1151.

                                     

2. Chipsets

Pentium 4 chipsets

i845GV/GE/i848P/i865G/GV/P/PE/i910GL/i915G/GL/GV/P/PL/i925X/XE/

SiS

SiS 649/649FX/655/656/656FX/662/671/671FX/671DX/672

VIA

PT800/PM800/PT880/PM880/P4M800/P4M800 Pro/PT880 Pro/PT880 Ultra/PT894/PT894 Pro/P4M890/PT890/P4M900

ATI

ATI Radeon Xpress 200; ATI Radeon Xpress 1250, ATI CrossFire Xpress 3200

                                     

2.1. Chipsets Pentium 4 chipsets

i845GV/GE/i848P/i865G/GV/P/PE/i910GL/i915G/GL/GV/P/PL/i925X/XE/

                                     

2.2. Chipsets SiS

SiS 649/649FX/655/656/656FX/662/671/671FX/671DX/672

                                     

2.3. Chipsets VIA

PT800/PM800/PT880/PM880/P4M800/P4M800 Pro/PT880 Pro/PT880 Ultra/PT894/PT894 Pro/P4M890/PT890/P4M900

                                     

2.4. Chipsets ATI

ATI Radeon Xpress 200; ATI Radeon Xpress 1250, ATI CrossFire Xpress 3200



                                     

2.5. Chipsets Nvidia

nForce4 Ultra; nForce4 SLI XE; nForce4 SLI; nForce4 SLI X16; nForce 570 SLI; nForce 590 SLI; nForce 610i; nForce 630i; nForce 650i Ultra; nForce 650i SLI; nForce 680i LT SLI; nForce 680i SLI; nForce 730i; nForce 740i SLI; nForce 750i SLI; nForce 760i SLI; nForce 780i SLI; nForce 790i SLI; GeForce 9300; GeForce 9400

Sources:

LGA 775 was the last Intel socket for desktops, for which third-party companies manufactured chipsets. Nvidia was the last third-party manufacturer of LGA 775 chipsets, as other third-parties discontinued their products earlier. All chipsets for superseding sockets were exclusively designed and manufactured by Intel, a practice later also adopted by AMD when they launched first APUs in 2011.

                                     

3. Improvements in heat dissipation

The force from the load plate ensures that the processor is completely level, giving the CPUs upper surface optimal contact with the heat sink or cold-water block fixed onto the top of the CPU to carry away the heat generated by the CPU. This socket also introduces a new method of connecting the heat dissipation interface to the chip surface and motherboard. With LGA 775, the heat dissipation interface is connected directly to the motherboard on four points, compared with the two connections of the Socket 370 and the "clamshell" four-point connection of the Socket 478. This was done to avoid the reputed danger of the heat sinks/fans of pre-built computers falling off in transit. LGA 775 was announced to have better heat dissipation properties than the Socket 478 it was designed to replace, but the Prescott core CPUs in their early incarnations ran much hotter than the previous Northwood-core Pentium 4 CPUs, and this initially neutralized the benefits of better heat transfer. However, modern Core 2 processors run at much lower temperatures than the Prescott CPUs they replace.



                                     

4. LGA 775 mechanical load limits

All LGA 775 processors have the following mechanical maximum load limits which should not be exceeded during heat sink assembly, shipping conditions, or standard use. Load above those limits could crack the processor die and make it unusable.

The transition to the LGA packaging has lowered those load limits, which are smaller than the load limits of Socket 478 processors but they are bigger than Socket 370, Socket 423 and Socket A processors, which were fragile. They are large enough to ensure that processors will not crack.

                                     

5. LGA 775 compatibility

Compatibility is quite variable, as earlier chipsets Intel 915 and below tend to support only single core Netburst Pentium 4 and Celeron CPUs at an FSB of 533/800 MT/s. Intermediate chipsets e.g. Intel 945 commonly support both single core Pentium 4-based CPUs as well as dual core Pentium D processors. Some 945 chipset-based motherboards could be given a BIOS upgrade to support 65nm Core-based CPUs. For other chipsets, it also varies, as LGA 775 CPU support is a complicated mixture of chipset capability, voltage regulator limitations and BIOS support. For example G41 chipset doesnt support NetBurst CPUs such as Pentium D, Pentium Extreme Edition, Pentium 4 and Celeron D.

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