LGA 775
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LGA 775 ( land grid array 775), also known as Socket T, is an
Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, and Delaware General Corporation Law, incorporated in Delaware. Intel designs, manufactures, and sells computer compo ...
desktop
CPU socket In computer hardware, a CPU socket or CPU slot contains one or more mechanical components providing mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). This allows for placing and replacing the centr ...
. Unlike PGA CPU sockets, such as its predecessor
Socket 478 Socket 478, also known as mPGA478 or mPGA478B, is a 478-contact CPU socket used for Intel's Pentium 4 and Celeron series Central processing unit, CPUs. Socket 478 was launched in August 2001 in advance of the Northwood core to compete with AMD ...
, LGA 775 has no socket holes; instead, it has 775 protruding pins which touch contact points on the underside of the processor (CPU). Intel started selling LGA 775 (Socket T) CPUs with the 64-bit version of their 90 nm "Prescott"-based Pentium 4 HT. 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 The socket was superseded by the LGA 1156 (Socket H) and LGA 1366 (Socket B) sockets.


LGA 775 processors

(Note: Some of the processors listed here might not work on newer Intel based chipsets; see "LGA 775 compatibility" below.) *
Pentium 4 Pentium 4 is a series of single-core central processing unit, CPUs for Desktop computer, desktops, laptops and entry-level Server (computing), servers manufactured by Intel. The processors were shipped from November 20, 2000 until August 8, 20 ...
* Pentium 4 Extreme Edition *
Pentium D Pentium D is a range of desktop 64-bit x86-64 processors based on the NetBurst microarchitecture, which is the Multi-core processor, dual-core variant of the Pentium 4 manufactured by Intel. Each CPU comprised two cores. The brand's first process ...
*
Celeron Celeron is a series of IA-32 and x86-64 computer microprocessor, microprocessors targeted at low-cost Personal computer, personal computers, manufactured by Intel from 1998 until 2023. The first Celeron-branded CPU was introduced on April 15, ...
/ Celeron D * Pentium Dual-Core * Pentium Extreme Edition * Core 2 Duo/ Core 2 Quad * Core 2 Extreme


Heatsink design

For LGA 775, the distance between the screw-holes for the heatsink is 72 mm. Such heat-sinks are not interchangeable with heatsinks for sockets that have a distance of 75 mm, such as LGA 1156, LGA 1155, LGA 1150, LGA 1151 and
LGA 1200 LGA 1200, also known as Socket H5, is a zero insertion force flip-chip land grid array (LGA) CPU socket, socket, compatible with Intel desktop Central processing unit, processors Comet Lake (10th gen) and Rocket Lake (11th-gen) desktop CPUs, whic ...
.


Chipsets

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 (its final product was MCP7A family, marketed as GeForce 9300/9400, launched in October 2008), 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 Advanced Micro Devices, Inc. (AMD) is an American multinational corporation and technology company headquartered in Santa Clara, California and maintains significant operations in Austin, Texas. AMD is a hardware and fabless company that de ...
when they first launched APUs in 2011 (
Socket AM3+ Socket AM3+ is a modification of Socket AM3, which was released on February 9, 2009. AM3+ was released in mid-2011 designed for CPUs which use the AMD Bulldozer (processor), Bulldozer microarchitecture and retains compatibility with processors mad ...
processors, also launched in 2011, were usually paired with motherboard with AMD chipsets, but some motherboards using third-party chipsets were also manufactured, usually with Nvidia chipsets, as the Socket AM3+ design was directly extended from the earlier
Socket AM3 Socket AM3 is a CPU socket for AMD processors. AM3 was launched on February 9, 2009 as the successor to Socket AM2+, alongside the initial grouping of Phenom II processors designed for it. The sole principal change from AM2+ to AM3 is support fo ...
design).


Intel


Core 2 Chipsets

*Lakeport: 945PL / 945P / 945G / 945GC / 945GZ / 955X / 946PL / 946GZ P *Broadwater: i955X / i946 / 946GZ / PL / 965 / i975 / Q965 / P965 / G965 / Q963 / i975X *Bearlake: X35 / P35 / Q35 / G35 / P33 / G33 / Q33 / P31 / G31 / X38 / X48 *Eaglelake: P45 / P43 / G45 / G43 / G41 / B43 / Q43 / Q45
945PLS3


SiS

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


VIA

* PT800 * PM800 * PT880 * PM880 * P4M800 * P4M800 Pro * PT880 Pro ** Supports both AGP and PCI-Express at the same time, however only one port can be used at a time. A similar design can also be found in some
Socket 939 Socket 939 (also known as Socket AM1) is a CPU socket released by AMD in June 2004 to supersede the previous Socket 754 for Athlon 64 processors. Socket 939 was succeeded by Socket AM2 in May 2006. It was the second socket designed for AMD's AMD ...
boards. * PT880 Ultra * PT894 * PT894 Pro * P4M890 * PT890 * P4M900


ATI

* ATI Radeon Xpress 200 * ATI Radeon Xpress 1250 * ATI CrossFire Xpress 3200


Nvidia

* nForce4 Ultra * nForce4 SLI XE * nForce4 SLI; * nForce4 SLI X16 * nForce 570 SLI * nForce 590 SLI * nForce 610i * nForce 620i * 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


Improvements in heat dissipation

The force from the load plate ensures that the processor is completely level, giving the CPU's upper surface optimal contact with the
heat sink A heat sink (also commonly spelled heatsink) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant, where it is thermal management (electronics), ...
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 Socket 370 and the "clamshell" four-point connection of
Socket 478 Socket 478, also known as mPGA478 or mPGA478B, is a 478-contact CPU socket used for Intel's Pentium 4 and Celeron series Central processing unit, CPUs. Socket 478 was launched in August 2001 in advance of the Northwood core to compete with AMD ...
. 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 Pentium 4 is a series of single-core central processing unit, CPUs for Desktop computer, desktops, laptops and entry-level Server (computing), servers manufactured by Intel. The processors were shipped from November 20, 2000 until August 8, 20 ...
CPUs, and this initially neutralized the benefits of better heat transfer. However, the later
Core 2 Intel Core 2 is a processor family encompassing a range of Intel's mainstream 64-bit x86-64 single-, dual-, and quad-core microprocessors based on the Core microarchitecture. The single- and dual-core models are single- die, whereas the quad-c ...
processors run at much lower temperatures than the Prescott CPUs they replaced. Processors with lower TDP and clock speeds only used Thermal Interface Compound in between the die and the integrated heat spreader (IHS), while processors with higher TDP and clock speeds have the die soldered directly to the IHS, allowing for better heat transfer between the CPU and the integrated heat spreader.


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 limits are included in the table below. The transition to the LGA packaging has lowered those load limits, which are smaller than the load limits of
Socket 478 Socket 478, also known as mPGA478 or mPGA478B, is a 478-contact CPU socket used for Intel's Pentium 4 and Celeron series Central processing unit, CPUs. Socket 478 was launched in August 2001 in advance of the Northwood core to compete with AMD ...
processors but they are bigger than Socket 370, Socket 423 and
Socket A Socket A (also known as Socket 462) is a zero insertion force pin grid array (PGA) CPU socket used for AMD processors ranging from the Athlon Thunderbird to the Athlon XP/MP 3200+, and AMD budget processors including the Duron and Sempron. ...
processors, which were fragile. They are large enough to ensure that processors will not crack.


LGA 775 compatibility

Compatibility is quite variable, as earlier chipsets (Intel 915 and below) tend to support only single core
NetBurst The NetBurst microarchitecture, called P68 inside Intel, was the successor to the P6 microarchitecture in the x86 family of central processing units (CPUs) made by Intel. The first CPU to use this architecture was the Willamette-core Pentium ...
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 motherboards using the 945 chipset could be given a BIOS upgrade to support 65nm Core-based processors. Other chipsets have varying levels of CPU support, generally following the release of contemporary CPUs, as LGA 775 CPU support is a complicated mixture of chipset capability, voltage regulator limitations and BIOS support. For example, the newer Q45 chipset does not support NetBurst-based CPUs such as the Pentium 4, Pentium D, Pentium Extreme Edition, and Celeron D.


Virtualization capabilities

Some
Core 2 Intel Core 2 is a processor family encompassing a range of Intel's mainstream 64-bit x86-64 single-, dual-, and quad-core microprocessors based on the Core microarchitecture. The single- and dual-core models are single- die, whereas the quad-c ...
and other LGA 775 processors are capable of hardware-accelerated virtualization. However, more recent hypervisors might not be compatible with these CPUs because they lack support for Extended Page Tables.


See also

*
List of Intel processors This generational list of Intel processors attempts to present all of Intel's processors from the 4-bit 4004 (1971) to the present high-end offerings. Concise technical data is given for each product. Latest 15th generation Core Deskto ...
* List of Intel Pentium 4 processors *
List of Intel Core 2 processors A list is a set of discrete items of information collected and set forth in some format for utility, entertainment, or other purposes. A list may be memorialized in any number of ways, including existing only in the mind of the list-maker, but ...
*
List of Intel Xeon processors The following is a list of Xeon, Intel Xeon microprocessors, by generation. P6-based Pentium II Xeon * List of Intel Xeon processors (P6-based)#ark49943, Pentium II Xeon 400 * List of Intel Xeon processors (P6-based)#ark49942, Pentium II X ...


References


External links

* {{DEFAULTSORT:Lga 775 LGA 0775