LGA 2066

Type	LGA
Chip form factors	Flip-chip land grid array (FCLGA)
Contacts	2066
FSB protocol	Intel QPI DMI 3.0
Processors	Kaby Lake-X Skylake-X Skylake-W Cascade Lake-X Cascade Lake-W
Predecessor	LGA 2011
Successor	LGA 4189
Memory support	DDR4
This article is part of the CPU socket series

LGA 2066, also called Socket R4, is a CPU socket by Intel that debuted with Skylake-X and Kaby Lake-X processors in June 2017.^[1] It replaces Intel's LGA 2011-3 (R3) in the performance, high-end desktop and Workstation platforms (based on the X299 "Basin Falls" and C422 chipsets), while LGA 3647 (Socket P) replaces LGA 2011-3 (R3) in the server platforms based on Skylake-SP (Xeon "Purley").

Compatible processors

High-End Desktop (HEDT)

All of these CPUs require the Intel X299 chipset to work. So, the C422 chipset is strictly limited to work with workstation processors only.

Kaby Lake-X

Kaby Lake-X processors were discontinued in May 2018. Starting October 2019, BIOS updates for most of the X299-based motherboards removed support for Kaby Lake-X processors.^[2]

Name	Cores (threads)	Base Clock	Turbo Boost 2.0		Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Name	Cores (threads)	Base Clock	Single core	All cores	Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Core i5-7640X	04 (4)	4.0 GHz	4.2 GHz	4.0 GHz	—	2 × DDR4-2666 up to 64 GB	0256 KB per core	06	16	112 W	Q2'17	0$242
Core i7-7740X	04 (8)	4.3 GHz	4.5 GHz		—	2 × DDR4-2666 up to 64 GB	0256 KB per core	08	16	112 W	Q2'17	0$339

Skylake-X 7000-series

Name	Cores (threads)	Base Clock	Turbo Boost 2.0		Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Name	Cores (threads)	Base Clock	Single core	All cores	Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Core i7-7800X	06 (12)	3.5 GHz	4.0 GHz		N/A	4 × DDR4-2400 up to 128 GB	1 MB per core	08.25	28	140 W	Q2'17	0$389
Core i7-7820X	08 (16)	3.6 GHz	4.3 GHz	4.0 GHz	4.5 GHz	4 × DDR4-2666 up to 128 GB		11	28			0$599
Core i9-7900X	10 (20)	3.3 GHz		4.0 GHz	4.5 GHz			13.75	44			0$999
Core i9-7920X	12 (24)	2.9 GHz		3.8 GHz	4.4 GHz			16.5			Q3'17	$1199
Core i9-7940X	14 (28)	3.1 GHz		3.8 GHz				19.25		165 W		$1399
Core i9-7960X	16 (32)	2.8 GHz	4.2 GHz	3.6 GHz				22				$1699
Core i9-7980XE	18 (36)	2.6 GHz	4.2 GHz	3.4 GHz				24.75				$1999

Skylake-X 9000-series

Name	Cores (threads)	Base Clock	Turbo Boost 2.0		Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Name	Cores (threads)	Base Clock	Single core	All cores	Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Core i7-9800X	8 (16)	3.8 GHz	4.4 GHz		4.5 GHz	4 × DDR4-2666 up to 128 GB	1 MB per core	16.5	44	165 W	Q4'18	$589
Core i9-9820X	10 (20)	3.3 GHz	4.1 GHz		4.2 GHz			16.5				$889
Core i9-9900X	10 (20)	3.5 GHz	4.4 GHz		4.5 GHz			19.25				$989
Core i9-9920X	12 (24)	3.5 GHz										$1189
Core i9-9940X	14 (28)	3.3 GHz										$1387
Core i9-9960X	16 (32)	3.1 GHz						22				$1684
Core i9-9980XE	18 (36)	3.0 GHz		3.8 GHz				24.75				$1999

Cascade Lake-X

Name	Cores (threads)	Base Clock	Turbo Boost 2.0		Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Name	Cores (threads)	Base Clock	Single core	All cores	Turbo Boost 3.0	Memory support	L2 cache	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Core i9-10900X	10 (20)	3.7 GHz	4.5 GHz	4.3 GHz	4.7 GHz	4 × DDR4-2933 up to 256 GB	1 MB per core	19.25	48	165W	Q4'19	$599
Core i9-10920X	12 (24)	3.5 GHz	4.6 GHz	4.3 GHz	4.8 GHz							$700
Core i9-10940X	14 (28)	3.3 GHz		4.1 GHz								$797
Core i9-10980XE	18 (36)	3.0 GHz		3.8 GHz				24.75				$1000

Workstation

Take note that certain types of Xeon processors will not work on this socket, like Skylake-P.

Skylake-W

Name	Cores (threads)	Base Clock	Turbo Boost 2.0		Memory support	L2 cache^[3]	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Name	Cores (threads)	Base Clock	Single core	All cores	Memory support	L2 cache^[3]	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Xeon W‑2102	04 (4)	2.9 GHz	N/A		4 x DDR4‑2400 up to 512 GB	1 MB per core	08.25	48	120 W	Q3'17	$202
Xeon W‑2104	04 (4)	3.2 GHz	N/A		4 x DDR4‑2400 up to 512 GB						$255
Xeon W‑2123	04 (8)	3.6 GHz	3.9 GHz	3.7 GHz	4 × DDR4‑2666 up to 512 GB						$294
Xeon W‑2125	04 (8)	4.0 GHz	4.5 GHz	4.4 GHz							$444
Xeon W‑2133	06 (12)	3.6 GHz	3.9 GHz	3.8 GHz					140 W		$617
Xeon W‑2135	06 (12)	3.7 GHz	4.5 GHz	4.4 GHz							$835
Xeon W‑2145	08 (16)	3.7 GHz		4.3 GHz			11				$1113
Xeon W‑2155	10 (20)	3.3 GHz		4.0 GHz			13.75				$1440
Xeon W‑2175	14 (28)	2.5 GHz	4.3 GHz	3.3 GHz			19.25			Q4'17	$1950
Xeon W‑2195	18 (36)	2.3 GHz	4.3 GHz	3.2 GHz			24.75			Q3'17	$2553

Cascade Lake-W

Name	Cores (threads)	Base Clock	Turbo Boost 2.0		Turbo Boost 3.0	Memory support	L2 cache^[3]	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Name	Cores (threads)	Base Clock	Single core	All cores	Turbo Boost 3.0	Memory support	L2 cache^[3]	L3 cache (MB)	PCIe 3.0 lanes	TDP	Release date	Price (USD)
Xeon W-2223	4 (8)	3.6 GHz	3.9 GHz	3.7 GHz	N/A	4 × DDR4‑2666 up to 1 TB	1 MB per core	8.25	48	120 W	Q4'19	$297
Xeon W-2225	4 (8)	4.1 GHz	4.6 GHz	4.5 GHz		4 x DDR4-2933 up to 1 TB				105 W		$444
Xeon W-2235	6 (12)	3.8 GHz	4.6 GHz	4.3 GHz						130 W		$555
Xeon W-2245	8 (16)	3.9 GHz	4.5 GHz	4.5 GHz	4.7 GHz			16.5		155 W		$667
Xeon W-2255	10 (20)	3.7 GHz	4.5 GHz	4.3 GHz	4.7 GHz			19.25		165 W		$778
Xeon W-2265	12 (24)	3.5 GHz	4.6 GHz	4.3 GHz	4.8 GHz							$944
Xeon W-2275	14 (28)	3.3 GHz		4.1 GHz								$1112
Xeon W-2295	18 (36)	3.0 GHz		3.8 GHz				24.75				$1333

References

^ "First Intel Core X-Series Processors Pre-Orders Begin Today, Available Starting June 26". Intel Newsroom. Retrieved 2020-05-18.
^ "X299 BIOS Update for Intel Cascade Lake-X Will Kill Kaby Lake-X Support".Tom's Hardware.
^ ^a ^b "Skylake-X's New L3 Cache Architecture". AnandTech.

CPU sockets and slots by Intel

Desktop sockets

Slot	Slot 1 (1996–1999)
PGA	370 (1998–2001) 423 (W 2000–2001) 478 (N 2001–2004)
LGA	775 (T 2004–2009) 1366 (B 2008–2010) 1156 (H1 2009–2010) 2011 (R 2011–2013) 1155 (H2 2011–2012) 1150 (H3 2013–2014) 2011-3 (R3 2014–2016) 1151 (H4 2015–2019) 2066 (R4 2017-2019) 1200 (H5 2020-2021) 1700 (V 2021-2023) 1851 (V1 2024)

Mobile sockets

MMC-1
MMC-2
Socket 615
Socket 495
Socket 479 (2001)
Socket M (2006)
Socket P (2007)
Socket G1 (2009)
Socket G2 (2011)
Socket G3 (2013)

Server sockets

Socket 8 (1995)

Xeon processors

Slot	Slot 2 (1998–2000)
PGA	603 (2001–2004) 604 (2002–2007)
LGA	771 (J 2006) 1366 (B 2008) 1156 (H1 2009) 1567 (LS 2010) 1155 (H2 2011) 2011 (R 2011) 1356 (B2 2012) 1150 (H3 2013) 2011-1 (R2 2014) 2011-3 (R3 2014) 1151 (H4 2015) 3647 (P 2016) 2066 (R4 2017-2019) 1200 (2020) 4189 (P5 2020) 4677 (E 2023) 7529 (2024)

Itanium processors

418 (2001)
611 (2002)
1248 (2010)

Pre-Pentium II PGA Sockets

Socket 1
Socket 2
Socket 3
Socket 6
Socket 4 (1993)
Socket 5 (1994–1995)
Socket 7 (1995–1997)
Super Socket 7 (1996–1999; non-Intel modification of the original Intel Socket 7)