# LGA 771

LGA 771, also known as Socket J, is a CPU interface introduced by Intel in 2006. 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

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%.

## 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 |

## 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 | 2.83 GHz | 2*2 MB | 95W | 667 | | |
| Xeon 5050 | 2 | 3.00 GHz | 2*2 MB | 95W | 667 | | |
| Xeon 5060 | 2 | 3.20 GHz | 2*2 MB | 130W | 1066 | | |
| Xeon 5063 | 2 | 3.20 GHz | 2*2 MB | 95W | 1066 | | |
| Xeon 5070 | 2 | 3.46 GHz | 2*2 MB | 130W | 1066 | | |
| Xeon 5080 | 2 | 3.73 GHz | 2*2 MB | 130W | 1066 | | |
| 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 | 2 | 1.86 GHz | 4 MB | 65W | 1066 | | |
| Xeon 5130 | 2 | 2.00 GHz | 4 MB | 65W | 1333 | Q2 2006 | |
| Xeon 5140 | 2 | 2.33 GHz | 4 MB | 65W | 1333 | Q2 2006 | |
| Xeon LV 5148 | 2 | 2.33 GHz | 4 MB | 40W | 1333 | Q2 2006 | |
| Xeon 5150 | 2 | 2.66 GHz | 4 MB | 65W | 1333 | Q2 2006 | |
| Xeon 5160 | 2 | 3.00 GHz | 4 MB | 80W | 1333 | | |
| Xeon 5200 series ||||||||
| Xeon E5205 | 2 | 1.86 GHz | 6 MB | 65W | 1066 | | |
| Xeon E5220 | 2 | 2.33 GHz | 6 MB | 65W | 1333 | | |
| Xeon L5215 | 2 | 1.86 GHz | 6 MB | 20W | 1066 | | |
| Xeon L5240 | 2 | 3.00 GHz | 6 MB | 40W | 1333 | | |
| Xeon X5260 | 2 | 3.33 GHz | 6 MB | 80W | 1333 | Q4 2007 | |
| Xeon X5270 | 2 | 3.50 GHz | 6 MB | 80W | 1333 | Q3 2008 | |
| Xeon X5272 | 2 | 3.40 GHz | 6 MB | 80W | 1600 | Q4 2007 | |

## 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 | 4 | 2.67 GHz | 12 MB | 80W | 1333 | Q1 2008 | OEM |
| Xeon X3363 | 4 | 2.83 GHz | 12 MB | 80W | 1333 | Q1 2008 | OEM |
| Xeon 5300 series ||||||||
| Xeon E5310 | 4 | 1.60 GHz | 8 MB | 80W | 1066 | Q4 2006 | |
| Xeon E5320 | 4 | 1.86 GHz | 8 MB | 80W | 1066 | Q4 2006 | |
| Xeon E5335 | 4 | 2.00 GHz | 8 MB | 80W | 1333 | Q1 2007 | |
| Xeon E5345 | 4 | 2.33 GHz | 8 MB | 80W | 1333 | Q1 2007 | |
| Xeon L5310 | 4 | 1.60 GHz | 8 MB | 50W | 1066 | Q1 2007 | |
| Xeon L5318 | 4 | 1.60 GHz | 8 MB | 40W | 1066 | Q1 2007 | |
| Xeon L5320 | 4 | 1.86 GHz | 8 MB | 50W | 1066 | Q1 2007 | |
| Xeon L5335 | 4 | 2.00 GHz | 8 MB | 50W | 1333 | Q3 2007 | |
| Xeon X5355 | 4 | 2.66 GHz | 8 MB | 120W | 1333 | Q4 2006 | |
| Xeon X5365 | 4 | 3.00 GHz | 8 MB | 150W | 1333 | Q3 2007 | |
| Xeon 5400 series ||||||||
| Xeon E5405 | 4 | 2.00 GHz | 12 MB | 80W | 1333 | Q4 2007 | |
| Xeon E5410 | 4 | 2.33 GHz | 12 MB | 80W | 1333 | Q4 2007 | |
| Xeon E5420 | 4 | 2.50 GHz | 12 MB | 80W | 1333 | Q4 2007 | |
| Xeon E5430 | 4 | 2.66 GHz | 12 MB | 80W | 1333 | Q4 2007 | |
| Xeon E5440 | 4 | 2.83 GHz | 12 MB | 80W | 1333 | Q1 2008 | |
| Xeon E5450 | 4 | 3.00 GHz | 12 MB | 80W | 1333 | Q4 2007 | |
| Xeon E5462 | 4 | 2.80 GHz | 12 MB | 80W | 1600 | Q4 2007 | |
| Xeon E5472 | 4 | 3.00 GHz | 12 MB | 80W | 1600 | Q4 2007 | |
| Xeon L5408 | 4 | 2.13 GHz | 12 MB | 40W | 1066 | Q1 2008 | |
| Xeon L5410 | 4 | 2.33 GHz | 12 MB | 50W | 1333 | Q1 2008 | |
| Xeon L5420 | 4 | 2.50 GHz | 12 MB | 50W | 1333 | Q1 2008 | |
| Xeon L5430 | 4 | 2.66 GHz | 12 MB | 50W | 1333 | Q3 2008 | |
| Xeon X5450 | 4 | 3.00 GHz | 12 MB | 120W | 1333 | Q4 2007 | |
| Xeon X5460 | 4 | 3.16 GHz | 12 MB | 120W | 1333 | Q4 2007 | |
| Xeon X5470 | 4 | 3.33 GHz | 12 MB | 120W | 1333 | Q3 2008 | |
| Xeon X5472 | 4 | 3.00 GHz | 12 MB | 120W | 1600 | Q4 2007 | |
| Xeon X5482 | 4 | 3.20 GHz | 12 MB | 150W | 1600 | Q4 2007 | |
| Xeon X5492 | 4 | 3.40 GHz | 12 MB | 150W | 1600 | Q3 2008 | |
| Core 2 Extreme QX9000 series ||||||||
| QX9775 | 4 | 3.20 GHz | 12 MB | 150W | 1600 | Q1 2008 | |