Socket J (LGA 771)
Release dateMay 16, 2006 (2006-05-16)
Designed byIntel
Manufactured byIntel
TypeLand Grid Array (LGA)
Chip form factorsFlip chip land grid array
Contacts771
FSB protocolAGTL+
FSB frequency667 MT/s, 1066 MT/s, 1333 MT/s, 1600 MT/s
Voltage rangeVaries (1,3625V max)
Processor dimensions40 mm x 40 mm
ProcessorsIntel Celeron 445
Intel Core 2 Duo E6x05
Intel Dual-Core Xeon E/X/L 50xx–52xx
Intel Quad-Core Xeon X 33xx
Intel Quad-Core Xeon E/X/L 53xx–54xx
Intel Core 2 Extreme QX9775
PredecessorSocket 604
VariantLGA 775 (Socket T)
SuccessorLGA 1366
Memory supportDDR2, DDR3
This article is part of the CPU socket series

LGA 771, also known as Socket J, is a CPU interface introduced by Intel in 2006.[1] It is used in Intel Core microarchitecture and NetBurst microarchitecture (Dempsey) based DP-capable server processors, the Dual-Core Xeon is codenamed Dempsey, Woodcrest, and Wolfdale and the Quad-Core processors Clovertown, Harpertown, and Yorkfield-CL. It is also used for the Core 2 Extreme QX9775, and blade servers designated under Conroe-CL.

It was succeeded by LGA 1366 for the Nehalem-based Xeon processors.

Technical specifications

An Xeon E5450 modified to fit in LGA 775 motherboards.

As its name implies, it is a land grid array with 771 contacts. The word "socket" in this instance is a misnomer, as the processor interface has no pin holes. Instead, it has 771 protruding lands which touch contact points on the underside of the microprocessor.

The "J" in "Socket J" refers to the now-canceled 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 and is almost pin compatible with LGA 775.

Compared to LGA 775 CPUs, LGA 771 CPUs are rotated 90 degrees and have two pins swapped. Small adapters developed by Chinese computer DIY enthusiasts are available to allow LGA 771 CPUs to be installed in LGA 775 motherboards, if the BIOS microcode supports them (but it is also possible to add supporting microcode manually). This also allows for overclocking of Xeon (LGA 771) processors when used in the correct (LGA 775) motherboards. Some overclockers have managed quite substantial overclocks such as 4.023GHz on a Xeon X5492 for a total overclock of just over 18%.[2]

Single core processors

Name Cores Frequency L2 Cache TDP FSB Release Date Price
Xeon 3000 series
Xeon L3014 1 2.40 GHz 3 MB 30W 1066 Q1 2008 OEM
Celeron 400 series
Celeron 445 1 1.87 GHz 512 KB 65W 1066 OEM
Core 2 Duo E6x05 series
Core 2 Duo E6305 1 1.87 GHz 2 MB 65W 1066 OEM
Core 2 Duo E6405 1 2.13 GHz 2 MB 65W 1066 OEM

Dual core processors

  • Hyper-threading supported only on 50xx series processors(codenamed Dempsey)
Name Cores Frequency L2 Cache TDP FSB Release date Price
Xeon 5000 series
Xeon 5030 2 2.66 GHz 2*2 MB 95W 667
Xeon 5040 2.83 GHz
Xeon 5050 3.00 GHz
Xeon 5060 3.20 GHz 130W 1066
Xeon 5063 3.20 GHz 95W
Xeon 5070 3.46 GHz 130W
Xeon 5080 3.73 GHz 130W
Xeon 3100 series
Xeon E3113 2 3.00 GHz 6 MB 65W 1333 Q3 2008 OEM
Xeon 5100 series
Xeon 5110 2 1.60 GHz 4 MB 65W 1066
Xeon 5120 1.86 GHz 1066
Xeon 5130 2.00 GHz 1333 Q2 2006
Xeon 5140 2.33 GHz
Xeon LV 5148 2.33 GHz 40W
Xeon 5150 2.66 GHz 65W
Xeon 5160 3.00 GHz 80W
Xeon 5200 series
Xeon E5205 2 1.86 GHz 6 MB 65W 1066
Xeon E5220 2.33 GHz 1333
Xeon L5215 2 1.86 GHz 6 MB 20W 1066
Xeon L5240 3.00 GHz 40W 1333
Xeon X5260 2 3.33 GHz 6 MB 80W 1333 Q4 2007
Xeon X5270 3.50 GHz 1333 Q3 2008
Xeon X5272 3.40 GHz 1600 Q4 2007
Intel Xeon 5140 processor. Compatible with LGA 771 motherboards. It has two cores at 2.33 GHz, 4 MB of L2 cache, an FSB speed of 1333 MT/s and a TDP of 65 W.[3]

Quad core processors

Name Cores Frequency L2 Cache TDP FSB Release date Price
Xeon 3300 Series
Xeon X3323 4 2.50 GHz 6 MB 80W 1333 Q1 2008 OEM
Xeon X3353 2.67 GHz 12 MB
Xeon X3363 2.83 GHz
Xeon 5300 series
Xeon E5310 4 1.60 GHz 8 MB 80W 1066 Q4 2006
Xeon E5320 1.86 GHz
Xeon E5335 2.00 GHz 1333 Q1 2007
Xeon E5345 2.33 GHz
Xeon L5310 4 1.60 GHz 8 MB 50W 1066 Q1 2007
Xeon L5318 1.60 GHz 40W
Xeon L5320 1.86 GHz 50W
Xeon L5335 2.00 GHz 50W 1333 Q3 2007
Xeon X5355 4 2.66 GHz 8 MB 120W 1333 Q4 2006
Xeon X5365 3.00 GHz 150W Q3 2007
Xeon 5400 series
Xeon E5405 4 2.00 GHz 12 MB 80W 1333 Q4 2007
Xeon E5410 2.33 GHz
Xeon E5420 2.50 GHz
Xeon E5430 2.66 GHz
Xeon E5440 2.83 GHz Q1 2008
Xeon E5450 3.00 GHz Q4 2007
Xeon E5462 2.80 GHz 1600
Xeon E5472 3.00 GHz 1600
Xeon L5408[4] 4 2.13 GHz 12 MB 40W 1066 Q1 2008
Xeon L5410 2.33 GHz 50W 1333
Xeon L5420 2.50 GHz
Xeon L5430 2.66 GHz Q3 2008
Xeon X5450 4 3.00 GHz 12 MB 120W 1333 Q4 2007
Xeon X5460 3.16 GHz
Xeon X5470 3.33 GHz Q3 2008
Xeon X5472 3.00 GHz 1600 Q4 2007
Xeon X5482 3.20 GHz 150W
Xeon X5492 3.40 GHz Q3 2008
Core 2 Extreme QX9000 series
QX9775 4 3.20 GHz 12 MB 150W 1600 Q1 2008

See also

References

  1. ↑ "Intel® Socket Test Technology for LGA771". Intel. Retrieved June 29, 2016.
  2. ↑ "Intel Xeon X5492 @ HWBOT". HWBOT. Retrieved November 30, 2022.
  3. ↑ "Intel® Xeon® Processor 5140 (4M Cache, 2.33 GHz, 1333 MHz FSB) Specifications". Retrieved July 28, 2016.
  4. ↑ "Intel® Xeon® Processor L5408 (12M Cache, 2.13 GHz, 1066 MHz FSB) Product Specifications". Intel® ARK (Product Specs). Retrieved September 9, 2017.
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