LGA 1151 socket: CPUs, chipsets and cooler fit
LGA 1151 is the Intel desktop socket that arrived in August 2015 with the 6th Gen Core processors, codenamed Skylake. It has 1,151 contacts and a 37.5 × 37.5 mm package. The name stayed the same for four processor generations, but the socket exists in two revisions that are not compatible with each other, and that is the single most important fact about it.
Quick facts
Overview
Revision 1 covers Skylake (6th Gen) and Kaby Lake (7th Gen) on 100 and 200 series chipsets. Revision 2 covers Coffee Lake (8th Gen) and Coffee Lake Refresh (9th Gen) on 300 series chipsets. The mechanical fit is identical, so a processor from the other revision drops into the socket, but it will not work. Intel changed the electrical layout, including the processor detection pin and a number of power and ground contacts, to feed the higher core counts of Coffee Lake.
In practice this means two rules. Intel and the board makers do not support an 8th or 9th Gen processor on a 100 or 200 series board, or a 6th or 7th Gen processor on a 300 series board, whatever the BIOS version. Buyers of used parts should check the processor generation against the chipset series before paying.
Processor generations
| Codename | Marketing name | Years | Notes |
|---|---|---|---|
| Skylake | 6th Gen Core | 2015 to 2016 | Revision 1. The first generation on the socket, launched with the Z170 chipset in August 2015. |
| Kaby Lake | 7th Gen Core | 2017 | Revision 1. Works on 100 series boards after a BIOS update and natively on 200 series. |
| Coffee Lake | 8th Gen Core | 2017 to 2018 | Revision 2. Needs a 300 series board. |
| Coffee Lake Refresh | 9th Gen Core | 2018 to 2019 | Revision 2. Includes the eight core Core i9-9900K. Some 300 series boards need a BIOS update. |
| Coffee Lake-S WS | Xeon E-2200 workstation | 2019 | Revision 2 workstation silicon with 4 to 8 cores and ECC DDR4-2666, launched in May 2019 on LGA 1151 with C242 and C246 boards. |
| Kaby Lake-DT | Xeon E3 v6 | 2017 | Workstation and entry server Xeons with 4 cores and HD P630 graphics, launched in 2017 on LGA 1151 with C236 boards. |
| Skylake-DT | Xeon E3 v5 series | 2015 to 2016 | Workstation silicon with ECC DDR4 memory, launched in October 2015 on C236 boards. |
Chipsets for LGA 1151
C240 series: C242 and C246
Workstation chipsets for Xeon E-2200 parts. Boards accept Coffee Lake-S WS SKUs with the shipping BIOS where the maker lists the part.
| Chipset | Segment | Notes |
|---|---|---|
| C246 | Workstation | Full workstation I/O with ECC support for Xeon E-2200. |
| C242 | Workstation | Entry workstation chipset for Xeon E-2200. |
300 series: B365 and Z390
Z390 arrived with the 9th Gen processors in October 2018 and B365 followed later, so both revision 2 generations start on these boards.
| Chipset | Segment | Notes |
|---|---|---|
| Z390 | Enthusiast | Unlocks K-series multipliers. |
| B365 | Value | A later addition to the 300 series. |
300 series: H310, B360, H370, Q370, Z370
Launched with the 8th Gen processors in 2017 and early 2018.
| Chipset | Segment | Notes |
|---|---|---|
| Z370 | Enthusiast | Unlocks K-series multipliers. |
| H370 | Mainstream | |
| B360 | Value | |
| H310 | Entry | |
| Q370 | Business |
200 series
Launched with Kaby Lake in early 2017. Revision 1 boards.
| Chipset | Segment | Notes |
|---|---|---|
| Z270 | Enthusiast | Unlocks K-series multipliers. |
| H270 | Mainstream | |
| B250 | Value | |
| Q270 | Business | |
| Q250 | Business |
100 series
Launched with Skylake in 2015. Revision 1 boards.
| Chipset | Segment | Notes |
|---|---|---|
| Z170 | Enthusiast | Unlocks K-series multipliers. |
| H170 | Mainstream | |
| B150 | Value | |
| H110 | Entry | |
| Q170 | Business | |
| Q150 | Business |
C230 series: C236
Workstation chipsets for Xeon E3 v6 parts.
| Chipset | Segment | Notes |
|---|---|---|
| C236 | Workstation | Entry workstation chipset for Xeon E3 v6. |
Why the two revisions do not mix
The gap between the two revisions is electrical, so nothing about the socket's shape warns you. Intel kept the 37.5 × 37.5 mm package and the 75 mm cooler mounting holes, then rewired contacts inside the same footprint for revision 2. The result is that a Core i7-8700 and a Core i7-7700 can both be dropped into the same physical socket, and only one of them is supported there.
The practical test is the chipset name. If it starts with 1 or 2, such as H110, B250 or Z270, the board takes 6th and 7th Gen processors. If it starts with 3, such as B360 or Z390, the board takes 8th and 9th Gen. Read it from the board's model name or the chipset printed near the socket.
Memory
Most LGA 1151 boards use DDR4, and revision 2 boards use DDR4 only. A few early revision 1 boards were built with DDR3L slots instead, and some had both kinds, though only one type can be used at a time. Intel's official limit for the Intel Core i9-9900K is DDR4-2666, and faster modules usually run at their rated speed when the board allows it.
Coolers and upgrade options
The 75 mm mounting pattern is shared with LGA 1155, LGA 1150 and LGA 1200, so a cooler bought for one of them usually fits all four. That makes LGA 1151 easy to refresh with a newer cooler.
Within the socket the upgrade path is short and strict. A 9th Gen chip such as the Core i9-9900K is the ceiling for revision 2 and is only available on 300 series boards. After that, moving to Intel's next socket means a new board, and LGA 1200 is not compatible with LGA 1151 processors either.
CPUs on LGA 1151
158 processor pages in the database, newest first.
| Processor | Cores / threads | Base / boost | TDP | Launched |
|---|---|---|---|---|
| Intel Core i9-9900KS | 8 / 16 | 4.0 / 5.0 GHz | 127 W | Oct 2019 |
| Intel Xeon E-2226GE | 6 / 6 | 3.4 / 4.6 GHz | 80 W | Jun 2019 |
| Intel Xeon E-2278GE | 8 / 16 | 3.3 / 4.7 GHz | 80 W | Jun 2019 |
| Intel Xeon E-2278GEL | 8 / 16 | 2.0 / 3.9 GHz | 35 W | Jun 2019 |
| Intel Xeon E-2224 | 4 / 4 | 3.4 / 4.6 GHz | 71 W | May 2019 |
| Intel Xeon E-2224G | 4 / 4 | 3.5 / 4.7 GHz | 71 W | May 2019 |
| Intel Xeon E-2226G | 6 / 6 | 3.4 / 4.7 GHz | 80 W | May 2019 |
| Intel Xeon E-2234 | 4 / 8 | 3.6 / 4.8 GHz | 71 W | May 2019 |
| Intel Xeon E-2236 | 6 / 12 | 3.4 / 4.8 GHz | 80 W | May 2019 |
| Intel Xeon E-2244G | 4 / 8 | 3.8 / 4.8 GHz | 71 W | May 2019 |
| Intel Xeon E-2246G | 6 / 12 | 3.6 / 4.8 GHz | 80 W | May 2019 |
| Intel Xeon E-2274G | 4 / 8 | 4.0 / 4.9 GHz | 83 W | May 2019 |
| Intel Xeon E-2276G | 6 / 12 | 3.8 / 4.9 GHz | 80 W | May 2019 |
| Intel Xeon E-2278G | 8 / 16 | 3.4 / 5.0 GHz | 80 W | May 2019 |
| Intel Xeon E-2286G | 6 / 12 | 4.0 / 4.9 GHz | 95 W | May 2019 |
| Intel Xeon E-2288G | 8 / 16 | 3.7 / 5.0 GHz | 95 W | May 2019 |
| Intel Celeron G4930 | 2 / 2 | 3.2 / 3.2 GHz | 54 W | Apr 2019 |
| Intel Celeron G4930T | 2 / 2 | 3.0 / 3.0 GHz | 35 W | Apr 2019 |
| Intel Celeron G4950 | 2 / 2 | 3.3 / 3.3 GHz | 54 W | Apr 2019 |
| Intel Core i3-9100 | 4 / 4 | 3.6 / 4.2 GHz | 65 W | Apr 2019 |
| Intel Core i3-9100E | 4 / 4 | 3.1 / 3.7 GHz | 65 W | Apr 2019 |
| Intel Core i3-9100F | 4 / 4 | 3.6 / 4.2 GHz | 65 W | Apr 2019 |
| Intel Core i3-9100T | 4 / 4 | 3.1 / 3.7 GHz | 35 W | Apr 2019 |
| Intel Core i3-9100TE | 4 / 4 | 2.2 / 3.2 GHz | 35 W | Apr 2019 |
| Intel Core i3-9300 | 4 / 4 | 3.7 / 4.3 GHz | 62 W | Apr 2019 |
| Intel Core i3-9300T | 4 / 4 | 3.2 / 3.8 GHz | 35 W | Apr 2019 |
| Intel Core i3-9320 | 4 / 4 | 3.7 / 4.4 GHz | 62 W | Apr 2019 |
| Intel Core i3-9350K | 4 / 4 | 4.0 / 4.6 GHz | 91 W | Apr 2019 |
| Intel Core i5-9400T | 6 / 6 | 1.8 / 3.4 GHz | 35 W | Apr 2019 |
| Intel Core i5-9500 | 6 / 6 | 3.0 / 4.4 GHz | 65 W | Apr 2019 |
| Intel Core i5-9500E | 6 / 6 | 3.0 / 4.2 GHz | 65 W | Apr 2019 |
| Intel Core i5-9500F | 6 / 6 | 3.0 / 4.4 GHz | 65 W | Apr 2019 |
| Intel Core i5-9500T | 6 / 6 | 2.2 / 3.7 GHz | 35 W | Apr 2019 |
| Intel Core i5-9500TE | 6 / 6 | 2.2 / 3.6 GHz | 35 W | Apr 2019 |
| Intel Core i5-9600 | 6 / 6 | 3.1 / 4.6 GHz | 65 W | Apr 2019 |
| Intel Core i5-9600T | 6 / 6 | 2.3 / 3.9 GHz | 35 W | Apr 2019 |
| Intel Core i7-9700 | 8 / 8 | 3.0 / 4.7 GHz | 65 W | Apr 2019 |
| Intel Core i7-9700E | 8 / 8 | 2.6 / 4.4 GHz | 65 W | Apr 2019 |
| Intel Core i7-9700F | 8 / 8 | 3.0 / 4.7 GHz | 65 W | Apr 2019 |
| Intel Core i7-9700T | 8 / 8 | 2.0 / 4.3 GHz | 35 W | Apr 2019 |
| Intel Core i7-9700TE | 8 / 8 | 1.8 / 3.8 GHz | 35 W | Apr 2019 |
| Intel Core i9-9900 | 8 / 16 | 3.1 / 5.0 GHz | 65 W | Apr 2019 |
| Intel Core i9-9900T | 8 / 16 | 2.1 / 4.4 GHz | 35 W | Apr 2019 |
| Intel Pentium Gold G5420 | 2 / 4 | 3.8 / 3.8 GHz | 54 W | Apr 2019 |
| Intel Pentium Gold G5420T | 2 / 4 | 3.2 / 3.2 GHz | 35 W | Apr 2019 |
| Intel Pentium Gold G5600T | 2 / 4 | 3.3 / 3.3 GHz | 35 W | Apr 2019 |
| Intel Pentium Gold G5620 | 2 / 4 | 4.0 / 4.0 GHz | 54 W | Apr 2019 |
| Intel Core i3-8100F | 4 / 4 | 3.6 / 3.6 GHz | 65 W | Jan 2019 |
| Intel Core i3-9350KF | 4 / 4 | 4.0 / 4.6 GHz | 91 W | Jan 2019 |
| Intel Core i5-9400 | 6 / 6 | 2.9 / 4.1 GHz | 65 W | Jan 2019 |
| Intel Core i5-9400F | 6 / 6 | 2.9 / 4.1 GHz | 65 W | Jan 2019 |
| Intel Core i5-9600KF | 6 / 6 | 3.7 / 4.6 GHz | 95 W | Jan 2019 |
| Intel Core i7-9700KF | 8 / 8 | 3.6 / 4.9 GHz | 95 W | Jan 2019 |
| Intel Core i9-9900KF | 8 / 16 | 3.6 / 5.0 GHz | 95 W | Jan 2019 |
| Intel Core i5-9600K | 6 / 6 | 3.7 / 4.6 GHz | 95 W | Oct 2018 |
| Intel Core i7-9700K | 8 / 8 | 3.6 / 4.9 GHz | 95 W | Oct 2018 |
| Intel Core i9-9900K | 8 / 16 | 3.6 / 5.0 GHz | 95 W | Oct 2018 |
| Intel Core i3-8020 | 4 / 4 | 3.7 / 3.7 GHz | 51 W | Sep 2018 |
| Intel Core i3-8120 | 4 / 4 | 3.7 / 3.7 GHz | 65 W | Sep 2018 |
| Intel Core i3-9000 | 4 / 4 | 3.7 / 3.7 GHz | 65 W | Sep 2018 |
| Intel Core i5-8420 | 6 / 6 | 2.9 / 4.1 GHz | 65 W | Sep 2018 |
| Intel Core i5-8420T | 6 / 6 | 1.8 / 3.4 GHz | 35 W | Sep 2018 |
| Intel Core i5-8550 | 6 / 6 | 3.0 / 4.3 GHz | 65 W | Sep 2018 |
| Intel Core i5-8650 | 6 / 6 | 3.1 / 4.5 GHz | 65 W | Sep 2018 |
| Intel Core i5-8650K | 6 / 6 | 3.7 / 4.5 GHz | 95 W | Sep 2018 |
| Intel Core i7-8670T | 6 / 12 | 2.3 / 3.7 GHz | 35 W | Sep 2018 |
| Intel Xeon E-2104G | 4 / 4 | 3.2 / 3.2 GHz | 65 W | Jul 2018 |
| Intel Xeon E-2124 | 4 / 4 | 3.3 / 4.3 GHz | 71 W | Jul 2018 |
| Intel Xeon E-2124G | 4 / 4 | 3.4 / 4.5 GHz | 71 W | Jul 2018 |
| Intel Xeon E-2126G | 6 / 6 | 3.3 / 4.5 GHz | 80 W | Jul 2018 |
| Intel Xeon E-2134 | 4 / 8 | 3.5 / 4.5 GHz | 71 W | Jul 2018 |
| Intel Xeon E-2136 | 6 / 12 | 3.3 / 4.5 GHz | 80 W | Jul 2018 |
| Intel Xeon E-2144G | 4 / 8 | 3.6 / 4.5 GHz | 71 W | Jul 2018 |
| Intel Xeon E-2146G | 6 / 12 | 3.5 / 4.5 GHz | 80 W | Jul 2018 |
| Intel Xeon E-2174G | 4 / 8 | 3.8 / 4.7 GHz | 71 W | Jul 2018 |
| Intel Xeon E-2176G | 6 / 12 | 3.7 / 4.7 GHz | 80 W | Jul 2018 |
| Intel Xeon E-2186G | 6 / 12 | 3.8 / 4.7 GHz | 95 W | Jul 2018 |
| Intel Core i7-8086K | 6 / 12 | 4.0 / 5.0 GHz | 95 W | Jun 2018 |
| Intel Celeron G4900 | 2 / 2 | 3.1 / 3.1 GHz | 54 W | Apr 2018 |
| Intel Celeron G4900T | 2 / 2 | 2.9 / 2.9 GHz | 35 W | Apr 2018 |
| Intel Celeron G4920 | 2 / 2 | 3.2 / 3.2 GHz | 54 W | Apr 2018 |
| Intel Core i3-8100T | 4 / 4 | 3.1 / 3.1 GHz | 35 W | Apr 2018 |
| Intel Core i3-8300 | 4 / 4 | 3.7 / 3.7 GHz | 62 W | Apr 2018 |
| Intel Core i3-8300T | 4 / 4 | 3.2 / 3.2 GHz | 35 W | Apr 2018 |
| Intel Core i5-8400T | 6 / 6 | 1.7 / 3.3 GHz | 35 W | Apr 2018 |
| Intel Core i5-8500T | 6 / 6 | 2.1 / 3.5 GHz | 35 W | Apr 2018 |
| Intel Core i5-8600T | 6 / 6 | 2.3 / 3.7 GHz | 35 W | Apr 2018 |
| Intel Core i7-8700T | 6 / 12 | 2.4 / 4.0 GHz | 35 W | Apr 2018 |
| Intel Pentium Gold G5400 | 2 / 4 | 3.7 / 3.7 GHz | 58 W | Apr 2018 |
| Intel Pentium Gold G5400T | 2 / 4 | 3.1 / 3.1 GHz | 35 W | Apr 2018 |
| Intel Pentium Gold G5500 | 2 / 4 | 3.8 / 3.8 GHz | 54 W | Apr 2018 |
| Intel Pentium Gold G5500T | 2 / 4 | 3.2 / 3.2 GHz | 35 W | Apr 2018 |
| Intel Pentium Gold G5600 | 2 / 4 | 3.9 / 3.9 GHz | 54 W | Apr 2018 |
| Intel Core i7-8670 | 6 / 12 | 3.1 / 4.4 GHz | 65 W | Jan 2018 |
| Intel Core i5-8500 | 6 / 6 | 3.0 / 4.1 GHz | 65 W | 2018 |
| Intel Core i5-8600 | 6 / 6 | 3.1 / 4.3 GHz | 65 W | 2018 |
| Intel Core i3-8100 | 4 / 4 | 3.6 / 3.6 GHz | 65 W | Oct 2017 |
| Intel Core i3-8350K | 4 / 4 | 4.0 / 4.0 GHz | 91 W | Oct 2017 |
| Intel Core i5-8400 | 6 / 6 | 2.8 / 4.0 GHz | 65 W | Oct 2017 |
| Intel Core i5-8600K | 6 / 6 | 3.6 / 4.3 GHz | 95 W | Oct 2017 |
Frequently asked questions
Are all LGA 1151 processors and motherboards compatible?
No. There are two revisions. 6th and 7th Gen processors need 100 or 200 series boards, and 8th and 9th Gen processors need 300 series boards.
Can an 8th Gen processor work in a Z270 board?
Not officially. A Z270 board is revision 1, and neither Intel nor the board makers support Coffee Lake processors on it, even with a BIOS update.
Does a 9th Gen processor need a BIOS update?
On H310, B360, H370, Q370 and Z370 boards it can. B365 and Z390 boards were made for 9th Gen processors. Check the board maker's CPU support list.
Does LGA 1151 use DDR4 or DDR3?
Mostly DDR4. Some early revision 1 boards use DDR3L. Revision 2 boards are DDR4 only.
Is LGA 1151 the same as LGA 1200?
No. LGA 1200 has 49 more contacts and a different notch position, so processors for one do not fit the other.
Sources and verification
- LGA 1151 on Wikipedia
- Intel Core i9-9900K specifications (Intel)
- Intel Core i9-9900K compatible chipsets (Intel)
- Intel Xeon E-2224 Processor specifications (Intel)
- Intel Xeon E-2224 specs (TechPowerUp)
Facts last checked against these sources on . Page last edited on .