Socket Geek

LGA 1155 socket: CPUs, chipsets and cooler fit

LGA 1155 is the Intel desktop socket that arrived in January 2011 with the 2nd Gen Core processors, codenamed Sandy Bridge. It has 1,155 contacts and a 37.5 × 37.5 mm package. It served two generations, Sandy Bridge in 2011 and Ivy Bridge in 2012, and Intel replaced it with LGA 1150 in 2013.

Quick facts

MakerIntel
Package typeLGA
Contacts1,155
Package size37.5 × 37.5 mm
IntroducedJanuary 2011
StatusLegacy
MemoryDDR3
PCIe from the CPUPCIe 2.0 x16 with Sandy Bridge, PCIe 3.0 x16 with Ivy Bridge
Cooler mounting holes75 × 75 mm
ReplacesLGA 1156
Replaced byLGA 1150

Overview

It is easy to confuse with its predecessor, LGA 1156. The two have the same size and almost the same name, but the notches in the socket sit in different places, and the electrical layouts differ. A processor made for LGA 1156 does not fit an LGA 1155 board, and the reverse is true as well. Do not try to force one into the other.

Boards for this socket run DDR3. The sections below explain which chipsets accept which processors, because Ivy Bridge needs a closer look than Sandy Bridge.

Processor generations

CodenameMarketing nameYearsNotes
Sandy Bridge2nd Gen Core2011The first generation on the socket. Includes the Core i7-2600K.
Ivy Bridge3rd Gen Core2012A die shrink on the same socket, with PCIe 3.0. Runs on most 6 series boards after a BIOS update.

Chipsets for LGA 1155

7 series

Launched in 2012 with Ivy Bridge. These boards accept both generations.

ChipsetSegmentNotes
Z77EnthusiastUnlocks K-series multipliers.
Z75PerformanceUnlocks K-series multipliers.
H77Mainstream
B75Value
Q77Business
Q75Business

6 series: H61, H67, P67, Z68

Launched with Sandy Bridge in 2011.

ChipsetSegmentNotes
Z68EnthusiastUnlocks K-series multipliers and supports the processor's integrated graphics.
P67PerformanceUnlocks K-series multipliers but cannot use the processor's integrated graphics.
H67MainstreamSupports integrated graphics, no overclocking.
H61Entry

6 series business: B65, Q65, Q67

Business oriented chipsets. They stay with Sandy Bridge.

ChipsetSegmentNotes
Q67Business
Q65Business
B65Business value

Sandy Bridge versus Ivy Bridge

Sandy Bridge processors such as the Core i7-2600K work on every LGA 1155 board, because every board was designed for them. Ivy Bridge came later and brought a smaller manufacturing process, lower power use and PCIe 3.0 graphics support. Those chips run natively on 7 series boards, and on most 6 series boards once the BIOS has been updated. B65, Q65 and Q67 boards cannot run Ivy Bridge.

The practical problem with the BIOS route is that the update has to be installed before the Ivy Bridge processor goes in. Many 6 series boards need a Sandy Bridge chip for that step, or a board feature that flashes the BIOS without a processor.

Overclocking and integrated graphics

Overclocking on this socket depends on the chipset as well as the processor. K-series chips need a Z68, P67, Z77 or Z75 board to change the multiplier. The other chipsets run the processor at its rated clocks.

Integrated graphics add another split among 6 series boards. P67 cannot use the processor's graphics at all, while Z68 combines overclocking with integrated graphics, which was the point of that chipset when it appeared. 7 series boards support both on the same chipset.

Memory and coolers

All LGA 1155 boards use DDR3. Intel's official limit for the Intel Core i7-2600K is DDR3-1333, and Ivy Bridge raised it to DDR3-1600. Overclocked memory can run faster on boards that allow it.

The 75 mm mounting holes are shared with LGA 1150, LGA 1151 and LGA 1200, which makes finding a replacement cooler easy. It also means a cooler can outlive several upgrades.

CPUs on LGA 1155

114 processor pages in the database, newest first.

ProcessorCores / threadsBase / boostTDPLaunched
Intel Celeron G1620T2 / 22.4 GHz35 WSep 2013
Intel Celeron G16302 / 22.8 GHz55 WSep 2013
Intel Core i3-32502 / 43.5 GHz55 WJun 2013
Intel Core i3-3250T2 / 43.0 GHz35 WJun 2013
Intel Celeron G16102 / 22.6 GHz55 WJan 2013
Intel Core i3-32102 / 43.2 GHz55 WJan 2013
Intel Pentium G20102 / 22.8 GHz55 WJan 2013
Intel Pentium G20202 / 22.9 GHz55 WJan 2013
Intel Pentium G2020T2 / 22.5 GHz35 WJan 2013
Intel Pentium G21302 / 23.2 GHz55 WJan 2013
Intel Celeron G1610T2 / 22.3 GHz35 WDec 2012
Intel Celeron G16202 / 22.7 GHz55 WDec 2012
Intel Celeron G4651 / 21.9 GHz35 WSep 2012
Intel Celeron G550T2 / 22.2 GHz35 WSep 2012
Intel Celeron G5552 / 22.7 GHz65 WSep 2012
Intel Core i3-32202 / 43.3 GHz55 WSep 2012
Intel Core i3-3220T2 / 42.8 GHz35 WSep 2012
Intel Core i3-32252 / 43.3 GHz55 WSep 2012
Intel Core i3-32402 / 43.4 GHz55 WSep 2012
Intel Core i3-3240T2 / 42.9 GHz35 WSep 2012
Intel Core i5-33304 / 43.0 / 3.2 GHz77 WSep 2012
Intel Core i5-3330S4 / 42.7 / 3.2 GHz65 WSep 2012
Intel Core i5-3335S4 / 42.7 / 3.2 GHz65 WSep 2012
Intel Core i5-3350P4 / 43.1 / 3.3 GHz69 WSep 2012
Intel Pentium G2100T2 / 22.6 GHz35 WSep 2012
Intel Pentium G21202 / 23.1 GHz55 WSep 2012
Intel Pentium G6452 / 22.9 GHz65 WSep 2012
Intel Pentium G645T2 / 22.5 GHz35 WSep 2012
Intel Celeron G540T2 / 22.1 GHz35 WJun 2012
Intel Celeron G5502 / 22.6 GHz65 WJun 2012
Intel Core i5-34704 / 43.2 / 3.6 GHz77 WJun 2012
Intel Core i5-3470S4 / 42.9 / 3.6 GHz65 WJun 2012
Intel Core i5-3470T2 / 42.9 / 3.6 GHz35 WJun 2012
Intel Core i5-3475S4 / 42.9 / 3.6 GHz65 WJun 2012
Intel Core i5-35704 / 43.4 / 3.8 GHz77 WJun 2012
Intel Core i5-3570S4 / 43.1 / 3.8 GHz65 WJun 2012
Intel Pentium G6402 / 22.8 GHz65 WJun 2012
Intel Pentium G640T2 / 22.4 GHz35 WJun 2012
Intel Pentium G860T2 / 22.6 GHz35 WJun 2012
Intel Pentium G8702 / 23.1 GHz65 WJun 2012
Intel Xeon E3-1220 v24 / 43.1 / 3.5 GHz69 WMay 2012
Intel Xeon E3-1220L v22 / 42.3 / 3.5 GHz17 WMay 2012
Intel Xeon E3-1225 v24 / 43.2 / 3.6 GHz77 WMay 2012
Intel Xeon E3-1230 v24 / 83.3 / 3.7 GHz69 WMay 2012
Intel Xeon E3-1240 v24 / 83.4 / 3.8 GHz69 WMay 2012
Intel Xeon E3-1245 v24 / 83.4 / 3.8 GHz77 WMay 2012
Intel Xeon E3-1265L v24 / 82.5 / 3.5 GHz45 WMay 2012
Intel Xeon E3-1270 v24 / 83.5 / 3.9 GHz69 WMay 2012
Intel Xeon E3-1275 v24 / 83.5 / 3.9 GHz77 WMay 2012
Intel Xeon E3-1280 v24 / 83.6 / 4.0 GHz69 WMay 2012
Intel Xeon E3-1290 v24 / 83.7 / 4.1 GHz87 WMay 2012
Intel Core i5-34504 / 43.1 / 3.5 GHz77 WApr 2012
Intel Core i5-3450S4 / 42.8 / 3.5 GHz65 WApr 2012
Intel Core i5-35504 / 43.3 / 3.7 GHz77 WApr 2012
Intel Core i5-3550S4 / 43.0 / 3.7 GHz65 WApr 2012
Intel Core i5-3570K4 / 43.4 / 3.8 GHz77 WApr 2012
Intel Core i5-3570T4 / 42.3 / 3.3 GHz45 WApr 2012
Intel Core i7-37704 / 83.4 / 3.9 GHz77 WApr 2012
Intel Core i7-3770K4 / 83.5 / 3.9 GHz77 WApr 2012
Intel Core i7-3770S4 / 83.1 / 3.9 GHz65 WApr 2012
Intel Core i7-3770T4 / 82.5 / 3.7 GHz45 WApr 2012
Intel Core i5-2380P4 / 43.1 / 3.4 GHz95 WJan 2012
Intel Core i5-2450P4 / 43.2 / 3.5 GHz95 WJan 2012
Intel Core i5-2550K4 / 43.4 / 3.8 GHz95 WJan 2012
Intel Celeron G4601 / 21.8 GHz35 WDec 2011
Intel Pentium 3502 / 41.2 GHz15 WNov 2011
Intel Core i7-2700K4 / 83.5 / 3.9 GHz95 WOct 2011
Intel Celeron G4401 / 11.6 GHz35 WSep 2011
Intel Celeron G5302 / 22.4 GHz65 WSep 2011
Intel Celeron G530T2 / 22.0 GHz35 WSep 2011
Intel Celeron G5402 / 22.5 GHz65 WSep 2011
Intel Core i3-2120T2 / 42.6 GHz35 WSep 2011
Intel Core i3-21252 / 43.3 GHz65 WSep 2011
Intel Core i3-21302 / 43.4 GHz65 WSep 2011
Intel Core i5-23204 / 43.0 / 3.3 GHz95 WSep 2011
Intel Pentium G6302 / 22.7 GHz65 WSep 2011
Intel Pentium G630T2 / 22.3 GHz35 WSep 2011
Intel Pentium G6322 / 22.7 GHz65 WSep 2011
Intel Pentium G8602 / 23.0 GHz65 WSep 2011
Intel Core i3-21022 / 43.1 GHz65 WJun 2011
Intel Core i3-21052 / 43.1 GHz65 WMay 2011
Intel Core i5-23104 / 42.9 / 3.2 GHz95 WMay 2011
Intel Core i5-2405S4 / 42.5 / 3.3 GHz65 WMay 2011
Intel Pentium G6202 / 22.6 GHz65 WMay 2011
Intel Pentium G620T2 / 22.2 GHz35 WMay 2011
Intel Pentium G6222 / 22.6 GHz65 WMay 2011
Intel Pentium G8402 / 22.8 GHz65 WMay 2011
Intel Pentium G8502 / 22.9 GHz65 WMay 2011
Intel Xeon E3-12904 / 83.6 / 4.0 GHz95 WMay 2011
Intel Xeon E3-12204 / 43.1 / 3.4 GHz80 WApr 2011
Intel Xeon E3-1220L2 / 42.2 / 3.4 GHz20 WApr 2011
Intel Xeon E3-12254 / 43.1 / 3.4 GHz95 WApr 2011
Intel Xeon E3-12304 / 83.2 / 3.6 GHz80 WApr 2011
Intel Xeon E3-12354 / 83.2 / 3.6 GHz95 WApr 2011
Intel Xeon E3-12404 / 83.3 / 3.7 GHz80 WApr 2011
Intel Xeon E3-12454 / 83.3 / 3.7 GHz95 WApr 2011
Intel Xeon E3-1260L4 / 82.4 / 3.3 GHz45 WApr 2011
Intel Xeon E3-12704 / 83.4 / 3.8 GHz80 WApr 2011
Intel Xeon E3-12754 / 83.4 / 3.8 GHz95 WApr 2011
Intel Xeon E3-12804 / 83.5 / 3.9 GHz95 WApr 2011

Frequently asked questions

Which processors fit LGA 1155?

Intel 2nd Gen (Sandy Bridge) and 3rd Gen (Ivy Bridge) Core desktop processors, plus the Pentium and Celeron models of those generations.

Is LGA 1155 compatible with LGA 1156?

No. They have the same size, but the notches and electrical layout differ, so processors do not fit the other socket.

Can I run an Ivy Bridge processor in a Z68 board?

Yes, usually after a BIOS update from the board maker. Z68 is a 6 series chipset that supports Ivy Bridge when the firmware is current.

Does LGA 1155 support DDR4?

No. LGA 1155 boards use DDR3.

Can an LGA 1150 processor fit an LGA 1155 board?

No. LGA 1150 processors use a different layout and notch position. The sockets look alike, but the processors are not interchangeable.

Sources and verification

  1. LGA 1155 on Wikipedia
  2. Intel Core i7-2600K specifications (Intel)
  3. Intel Core i7-2600K compatible chipsets (Intel)

Facts last checked against these sources on . Page last edited on .