Complete LGA 1151 CPU List: All Retail, Server, Engineering & Modified Processors

LGA1151 (also known as Socket H4) debuted in 2015 as the successor to LGA1150 and became one of Intel’s most successful and longest-lived sockets. Over its five-year lifespan, it spanned all popular processor lineups — from budget Celerons to flagship Core i9s. In 2020 it was replaced by LGA1200.

Unlike most previous sockets, LGA1151 has two hardware-incompatible versions (often referred to as v1 and v2). While both revisions share the same pin count and layout, they differ electrically: the first version supports 6th and 7th gen (Skylake and Kaby Lake), while the second supports 8th and 9th gen (Coffee Lake and Coffee Lake Refresh).

This article details LGA1151’s features, the architectures it supports, and provides a comprehensive list of every processor released for this socket — including engineering samples, server models, “mutant” CPUs, and chips never intended for retail sale.

LGA1151 Processor Architectures and Features

Skylake

In August 2015, Intel introduced the first 6th-gen processors based on the Skylake architecture, marking the transition to a new platform with DDR4 support.

Key architectural features:

• Process node: 14 nm
• Improved core architecture with ~6% IPC uplift over Broadwell
• Memory controller supporting DDR4-2133 and DDR3L-1600 (some boards also enabled standard DDR3 @ 1.5 V — unofficial and risky)
• DMI 3.0 interface (up to ~3.9 GB/s in each direction)
• Gen9 graphics with DirectX 12, OpenGL 4.5, OpenCL 2.0, HEVC decode, and 4K@60 Hz output
• Support for Thunderbolt 3 (via external controller) and SATA Express
• Speed Shift (hardware P-states): the CPU picks its own frequency instead of waiting for the OS, so it reacts to load changes much faster (needs Windows 10 or a recent Linux kernel)

Skylake became Intel’s longest-running core design: with modest refinements, the same core powered every desktop generation through Comet Lake (10th gen), until Rocket Lake replaced it in 2021. A notable downside was the TIM under the heatspreader: higher clocks on unlocked chips often required delidding for better thermals.

Kaby Lake

7th-gen Kaby Lake launched in January 2017. Breaking from the classic “tick-tock,” it brought no major architectural changes, but process improvements enabled higher clocks and slightly lower power.

Key Kaby Lake features:

• Process node: 14 nm+ (refined)
• IPC essentially unchanged from Skylake; higher base/boost clocks
• Integrated graphics with hardware HEVC (H.265) 10-bit and VP9 8/10-bit decode
• Support for HDR and HDCP 2.2
• Speed Shift v2 — faster response and improved adaptive frequency
• Official DDR4-2400 (DDR4-2133 on Celerons) and, as on Skylake, DDR3L-1600 at 1.35 V on boards with DDR3L slots
• Intel Optane Memory support: Core i3/i5/i7 on 200-series boards (and C236 server boards), not Pentium or Celeron
• Turbo Boost 2.0, with max clocks up to 4.5 GHz on the i7-7700K

Kaby Lake was a successful refresh. Highlights included the i7-7700K and the first unlocked Core i3 (i3-7350K), while Hyper-Threading came to Pentium (G4560, G4600, G4620) for the first time since the Pentium 4; the 2-core, 4-thread G4560 became a budget favorite. The thermal interface under the IHS remained the same, and high clocks still benefited from delidding.

Coffee Lake

8th-gen Coffee Lake arrived in fall 2017. For the first time in years, Intel increased core counts in the consumer segment — a direct response to AMD Ryzen.

Key features:

• Process node: 14 nm++ (further optimized), enabling higher clocks and slightly lower power
• More cores for Core i3/i5/i7 (Pentium Gold and Celeron stayed dual-core), plus more L3 cache
• Memory controller: official DDR4-2666 on Core i5/i7 and DDR4-2400 on Core i3, Pentium Gold and Celeron. Intel’s spec no longer lists DDR3L, but a few H310/H310C boards with DDR3 slots (e.g., Gigabyte H310M DS2V DDR3, Biostar H310MHD3) support 1.35 V DDR3L as a board-vendor feature
• Gen9.5 graphics, the same design as on Kaby Lake, renamed UHD Graphics 630/610

Coffee Lake marked a turning point: i7 became 6C/12T, i5 6C/6T, and i3 a true 4-core. The performance gain was significant, and the chips were competitive with Ryzen. The trade-off was incompatibility with 100/200-series chipsets. Intel cited power delivery requirements; enthusiasts later found ways to run Coffee Lake on older boards. TIM under the IHS still limited thermal headroom on flagship overclocks.

Coffee Lake Refresh

9th-gen processors arrived in Q4 2018 as the final evolution of LGA1151. The architecture remained Coffee Lake with important refinements and record-setting specs.

Key features:

• Process node: 14 nm++, the same as 8th gen, further tuned for higher clocks
• Higher core counts: up to 8C/16T for Core i9; up to 16 MB L3
• First Core i9 for the mainstream socket (the line debuted on LGA2066 in 2017)
• Core i7 lost Hyper-Threading and became 8C/8T; among Core chips only the i9 kept it (8C/16T). Core i5 and i3 stayed without HT, as on 8th gen
• Hardware fixes for Meltdown (V3) and L1TF on chips cut from the new 8-core die; its later R0 stepping is also immune to MDS. Core i3 and many i5 units (e.g., early i5-9400F) reuse the older 8th-gen dies and rely on microcode and OS mitigations. Spectre V1 is fixed in software, and V2/V4 need microcode plus OS patches, on every model
• Up to 128 GB DDR4 on Core i5/i7/i9 (with 32 GB modules and a board BIOS that supports them); 64 GB on Core i3 and below
• Return of solder under the IHS (STIM) on chips cut from the 8-core die: Core i5/i7/i9 K/KF models, i9-9900, i7-9700 and some i5-9400(F) units. This greatly improved OC thermals

Coffee Lake Refresh marked the final chapter of the LGA1151 era. Beyond 5 GHz clocks and the i9 branding, F/KF models without iGPU became common. Despite their age, 9th-gen flagships remain capable today.

Intel Processor Naming

Model names may include suffixes (e.g., Core i7-8700K). Common suffixes:

• K — unlocked multiplier
• P — weaker HD 510 graphics instead of HD 530 (Skylake only: i5-6402P, i3-6098P)
• KS — special edition, a higher-binned K chip (only the i9-9900KS)
• T — low-power 35 W version with lower clocks
• E, TE — embedded versions with long-term availability
• F — no integrated graphics (KF: unlocked and no iGPU)

You can also infer the architecture from the model number:

• Skylake — starts with 6 (Core i5-6600, Core i3-6300, …)
• Kaby Lake — starts with 7 (Core i5-7500, Core i3-7100, …)
• Coffee Lake — starts with 8 (Core i7-8700, Core i3-8300, …)
• Coffee Lake Refresh — starts with 9 (Core i7-9700, Core i3-9100, …)

All Socket 1151 Processors and Their Specifications

Every production LGA1151 processor is listed here, split into two tables by socket revision, because a CPU of one revision won’t start on a board of the other. The tables cover desktop Core, Pentium and Celeron, the server Xeon E3-1200 v5/v6 and Xeon E-2100/E-2200, and the CC150. Each table has its own filters, and the search box also finds a chip by its sSpec, the code printed on the lid.

LGA1151 v1 CPU List (Skylake and Kaby Lake)

These CPUs fit boards with 100- and 200-series chipsets: H110, B150, H170, Z170, B250, H270, Z270 and others. Xeon E3-1200 v5 and v6 officially work only on boards with C232 or C236.

LGA1151 v2 CPU List (Coffee Lake and Coffee Lake Refresh)

These CPUs fit boards with 300-series chipsets: H310, B360, B365, H370, Z370, Z390 and others. Xeon E-2100 and E-2200 officially work only on boards with C242 or C246.

Server Solutions

Xeon E3-1200 v5 and v6 are the server versions of Skylake and Kaby Lake. They need a board with a C232 or C236 chipset and don’t work on consumer 100/200-series boards without a BIOS mod. Compared with Core i5 and i7, they add ECC memory support; vPro needs a C236 board.

Learn more about the Xeon E3-1200 v5/v6 lineups — and how to run them on standard desktop motherboards — in this article.

Xeon E-2100 and E-2200 are their Coffee Lake and Coffee Lake Refresh successors (Q3 2018 and Q2 2019). They need an LGA1151 v2 board with a C242 or C246 chipset and don’t run on Z370, Z390 or other consumer boards. Like the E3 line, they support ECC memory; the E-2200 tops out at 8 cores and 16 threads (E-2278G, E-2288G).

CC150

A unique processor Intel made for Nvidia GeForce Now servers. It was never sold at retail, but later appeared on marketplaces. It’s an 8-core, 16-thread Coffee Lake Refresh chip without integrated graphics or Turbo Boost, running at 3.5 GHz. It works on 300-series boards with a BIOS that supports 9th-gen CPUs. More details about CC150 can be found here.

MODEL	INTEL CC150
Architecture	Coffee Lake Refresh, 14 nm
Cores \ Threads	8 \ 16
Memory Support	DDR4-2666, DDR3L-1600
Base Frequency	3500 MHz
L3 Cache	16 MB
TDP	95 W
Multiplier	Locked
Integrated Graphics	None
Approximate Price	AliExpress: $40 - $75 Check Price

Engineering Samples

Engineering samples are pre-production processors that may be unstable and have compatibility issues. They can have disabled features, altered specs, limited OC capability, or atypical thermals versus retail versions.

Q-Spec	uArc + Stepping + Core Config	CPUID	Freq + turbo + (all core) GHz	OC	iGPU	TDP	Closest Equivalent	SKU
QH8E	Skylake A0 4C8T	506E0h	2.2-2.6 (2.4)	BCLK	-	95 W	i7-6400T	Core i
QH8F	Skylake A0 4C8T	506E0h	2.2-2.6 (2.4)	BCLK	-	65 W	i7-6400T	Core i
QH8G	Skylake A0 4C8T	506E0h	2.2-2.6 (2.4)	BCLK	-	35 W	i7-6400T	Core i
QH73	Skylake A0 4C8T	506E0h	2.3-3.1 (2.9)	BCLK	-	95 W	i7-6400T	Core i
QH5N	Skylake A0 4C8T	506E0h	2.6-3.4 (3.2)	BCLK	-	95 W	E3-1230 V5	Xeon
QHQJ	Skylake Q0 4C8T	506E1h	1.6-2.2 (2.0)	BCLK	-	35 W	i7-6400T	Core i
QHQG(1)	Skylake Q0 4C8T	506E1h	2.2-2.6 (2.4)	BCLK	-	65 W	i7-6400T	Core i
QHQG(2)	Skylake Q0 4C8T	506E1h	2.2-2.6 (2.4)	BCLK	-	80 W	E3-1230 V5	Xeon
QHQF	Skylake Q0 4C8T	506E1h	2.6-3.4	BCLK	-	95 W	i7-6700K	Core i
QHVZ	Skylake Q0 4C4T	506E1h	2.2-2.7 (2.4)	BCLK	-	35 W	i5-6400T	Core i
QHVX	Skylake Q0 4C8T	506E1h	2.4-2.7 (2.4)	BCLK	-	35 W	i7-6400T	Core i
QHW0	Skylake Q0 2C4T	506E1h	2.1-2.1 (2.1)	BCLK	-	35 W	i3-6300T	Core i
QHJE	Skylake Q0 4C8T	506E1h	2.6-3.2 (3.0)	BCLK	-	80 W	E3-1230 V5	Xeon
QKYM	Kaby Lake A0 4C4T	506E8h	2.7-3.3 (3.1)	Locked	HD 630	65 W	i5-7400	Core i
QKYN	Kaby Lake A0 4C8T	506E8h	3.0-3.5 (3.2)	Locked	HD 630	65 W	i7-7700	Core i
QKYP	Kaby Lake A0 4C8T	506E8h	3.7-4.1	BCLK+Multiplier	HD 630	95 W	i7-7700K	Core i
QKYL	Kaby Lake A0 4C8T	506E8h	2.4-3.0 (2.7)	Locked	HD 630	35 W	i7-7700T	Core i
QL32	Kaby Lake A0 4C8T	506E8h	3.2-3.7 (3.4/3.5)	Locked	-	74 W	E3-1230 V6	Xeon
QL33	Kaby Lake A0 4C8T	506E8h	3.5-3.9 (3.7)	Locked	HD 630	78 W	E3-1245 V6	Xeon
QNBJ	Coffee Lake U0 6C12T	906EAh	1.6-3.6 (3.1)	Locked	UHD 630	35 W	i7-8700T	Core i
QNBH	Coffee Lake U0 6C12T	906EAh	2.9-4.0 (3.6)	Locked	UHD 630	65 W	i7-8700	Core i
QNBG	Coffee Lake U0 6C12T	906EAh	3.2-4.1	BCLK+Multiplier	UHD 630	95 W	i7-8700K	Core i
QNLU	Coffee Lake U0 6C12T	906EAh	3.7-4.2	BCLK+Multiplier	UHD 630	95 W	i7-8700K	Core i
QNLV	Coffee Lake U0 6C12T	906EAh	3.2-3.6	BCLK+Multiplier	UHD 630	95 W	i7-8700K	Core i
QNLW	Coffee Lake U0 6C12T	906EAh	3.1-4.2 (3.9)	Locked	UHD 630	65 W	i7-8700	Core i
QNCU	Coffee Lake U0 6C12T	906EAh	3.5-4.3 (4.1)	Locked	-	80 W	E2136	Xeon
QNCV	Coffee Lake U0 6C12T	906EAh	3.7-4.3 (4.1)	Locked	UHD P630	95 W	E2176G	Xeon
QNCW	Coffee Lake U0 6C12T	906EAh	3.4-4.3 (4.1)	Locked	UHD P630	80 W	E2146G	Xeon
QNMR	Coffee Lake U0 6C12T	906EAh	2.7-3.8	BCLK+Multiplier	UHD 630	65 W	i7-8700K	Core i
QNTM	Coffee Lake U0 6C6T	906EAh	3.0-3.0 (3.0)	Locked	UHD P630	80 W	E2106G	Xeon
QQC0	Coffee Lake P0 8C16T	906ECh	1.7-3.8 (3.1)	Locked	UHD 630	35 W	i9-9900T	Core i
QQZ6	Coffee Lake P0 8C16T	906ECh	1.7-3.8 (3.1)	Locked	UHD 630	35 W	i9-9900T	Core i
QQZ5	Coffee Lake P0 8C16T	906ECh	2.6-4.4 (4.2)	Locked	UHD 630	65 W	i9-9900T	Core i
QQBY	Coffee Lake P0 8C16T	906ECh	3.1-4.5	BCLK+Multiplier	UHD 630	95 W	i9-9900K	Core i
QQZ4	Coffee Lake P0 8C16T	906ECh	3.1-4.5	BCLK+Multiplier	UHD 630	95 W	i9-9900K	Core i
QQBZ	Coffee Lake P0 8C16T	906ECh	2.6-4.4 (4.2)	Locked	UHD 630	65 W	i9-9900K	Core i
QQM5	Coffee Lake P0 8C16T	906ECh	3.1-4.5 (4.3)	Locked	UHD P630	95 W	E2288G	Xeon
QRA1	Coffee Lake P0 8C16T	906ECh	3.1-4.5 (4.3)	Locked	UHD P630	?	E2288G	Xeon
QQM6	Coffee Lake P0 8C16T	906ECh	2.6-4.4 (4.2)	Locked	UHD P630	80 W	E2278G	Xeon
QRA2	Coffee Lake P0 8C16T	906ECh	2.6-4.4 (4.2)	Locked	UHD P630	80 W	E2278G	Xeon

General warning: Because these are ES/QS parts, actual specifications and availability may differ significantly from the listed data, and unreported variants may exist. Use with caution and expect potential compatibility issues with motherboards, memory, and peripherals that retail chips don’t show.

Xeon compatibility: Xeon SKUs require specific platform support and may not function on consumer boards without BIOS modifications.

Coffee Lake P0 bug: ~3% of early Coffee Lake P0 stepping chips (QQC0, QQBZ, QQBY, QQM6, QQM5) have unstable PCIe controllers causing device issues. Later P0 samples (QQZ6, QQZ5, QQZ4, QRA2, QRA1) are free of it. Other P0 variants may also be affected.

Mutants

Perhaps the strangest LGA1151 CPUs: mobile and other BGA chips adapted for desktop motherboards using interposer boards. Both ES and retail parts were modified. They can offer unique features (e.g., overclocking on any chipset) but won’t work out of the box: BIOS mod and flashing are required, and installation is more complex than with retail CPUs. More details here.

Compatibility

Compatibility depends primarily on the motherboard chipset. For desktop, there are 11 chipsets in the 100/200 series (1151 v1) and 8 in the 300 series (1151 v2). There are also four server chipsets: C232 and C236 (1151 v1), and C242 and C246 (1151 v2). The tables below show compatibility, overclocking and platform features for each chipset:

Compatibility and overclocking

Platform features

Figures are Intel’s maximums for each chipset. A board may expose fewer SATA or USB ports, Wi-Fi CNVi needs a matching module on the board, and splitting the CPU lanes (x8/x8, x8/x4/x4) also needs a board with the extra slots.

ECC memory works only on C-series boards and only with Xeon, Core i3, Pentium and Celeron; Core i5, i7 and i9 don’t support it. On H, B and Q chipsets, memory runs at the CPU’s rated speed: up to DDR4-2133 or DDR4-2400 on 100/200-series boards and up to DDR4-2666 on 300-series boards. Faster XMP profiles need a Z chipset.

Windows 11 officially supports every retail Coffee Lake and Coffee Lake Refresh CPU (8th and 9th gen, Xeon E-2100/E-2200 included), but none of the Skylake or Kaby Lake models, Xeon E3 v5/v6 included.

Did you know you can run “incompatible” CPUs on LGA1151 v1/v2 boards? Check out our full Coffee Mod breakdown to learn how.

Conclusion and Legacy

LGA1151 stands as one of Intel’s most successful sockets, spanning five years and four generations. Over its lifecycle, the platform saw:

• The transition from DDR3 to DDR4
• The “core wars” response to AMD Ryzen
• The introduction of 8-core CPUs to the mainstream desktop
• The emergence of unique mods and “mutant” processors
• The return of soldered heatspreaders (STIM) on flagships

Although it has since been succeeded by LGA1200, LGA1700 and LGA1851, LGA1151 remains relevant for budget builds and upgrades. Its broad CPU support, mature ecosystem, and affordable hardware make it an excellent choice for cost-conscious users seeking solid performance.

The socket’s legacy extends beyond its official lifespan through enthusiast innovation — from Coffee Mod techniques to Frankenstein processors — proving that a solid platform can remain relevant long after official support ends.

Intel’s high-end desktop and workstation chips of the same years, the Core X and Xeon W, are covered in our LGA2066 CPU list.