LGA 2066

Intel CPU socket

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 LGA 1200
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").

LGA 2066 and LGA 1151 are the last two Intel sockets to officially support Windows 7, Windows Server 2008 R2, Windows 8, Windows Server 2012, Windows 8.1 and Windows Server 2012 R2 and the earliest two Intel sockets to officially support all versions of Windows 11.

Compatible processors

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High-End Desktop (HEDT)

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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

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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	4 (4)	4.0 GHz	4.2 GHz	4.0 GHz	N/a	2 ×ばつ DDR4-2666 up to 64 GB	256 KB per core	6	16	112 W	Q2'17	242ドル
Core i7-7740X	4 (8)	4.3 GHz	4.5 GHz		N/a	2 ×ばつ DDR4-2666 up to 64 GB	256 KB per core	8	16	112 W	Q2'17	339ドル

Skylake-X 7000-series

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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	6 (12)	3.5 GHz	4.0 GHz		N/A	4 ×ばつ DDR4-2400 up to 128 GB	1 MB per core	8.25	28	140 W	Q2'17	389ドル
Core i7-7820X	8 (16)	3.6 GHz	4.3 GHz	4.0 GHz	4.5 GHz	4 ×ばつ DDR4-2666 up to 128 GB		11	28			599ドル
Core i9-7900X	10 (20)	3.3 GHz		4.0 GHz	4.5 GHz			13.75	44			999ドル
Core i9-7920X	12 (24)	2.9 GHz		3.8 GHz	4.4 GHz			16.5			Q3'17	1199ドル
Core i9-7940X	14 (28)	3.1 GHz		3.8 GHz				19.25		165 W		1399ドル
Core i9-7960X	16 (32)	2.8 GHz	4.2 GHz	3.6 GHz				22				1699ドル
Core i9-7980XE	18 (36)	2.6 GHz	4.2 GHz	3.4 GHz				24.75				1999ドル

Skylake-X 9000-series

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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 ×ばつ DDR4-2666 up to 128 GB	1 MB per core	16.5	44	165 W	Q4'18	589ドル
Core i9-9820X	10 (20)	3.3 GHz	4.1 GHz	4.2 GHz			16.5				889ドル
Core i9-9900X	10 (20)	3.5 GHz	4.4 GHz	4.5 GHz			19.25				989ドル
Core i9-9920X	12 (24)	3.5 GHz									1189ドル
Core i9-9940X	14 (28)	3.3 GHz									1387ドル
Core i9-9960X	16 (32)	3.1 GHz					22				1684ドル
Core i9-9980XE	18 (36)	3.0 GHz					3.8 GHz				24.75	1999ドル

Cascade Lake-X

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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 ×ばつ DDR4-2933 up to 256 GB	1 MB per core	19.25	48	165W	Q4'19	599ドル
Core i9-10920X	12 (24)	3.5 GHz	4.6 GHz	4.3 GHz	4.8 GHz							700ドル
Core i9-10940X	14 (28)	3.3 GHz		4.1 GHz								797ドル
Core i9-10980XE	18 (36)	3.0 GHz		3.8 GHz				24.75				1000ドル

Workstation

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Take note that certain types of Xeon processors will not work on this socket, like Skylake-P. There are four OEM variants that can be found in Apple Mac Pro: W-2140B and W-2150B (lower freq/TDP than their W-21x5 counterparts), W-2170B and W-2191B lack Trusted_Execution_Technology (TXT) in comparison.

Skylake-W

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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	4 (4)	2.9 GHz	N/A		4 x DDR4‐2400 up to 512 GB	1 MB per core	8.25	48	120 W	Q3'17	202ドル
Xeon W‐2104	4 (4)	3.2 GHz	N/A		4 x DDR4‐2400 up to 512 GB						255ドル
Xeon W‐2123	4 (8)	3.6 GHz	3.9 GHz	3.7 GHz	4 ×ばつ DDR4‐2666 up to 512 GB						294ドル
Xeon W‐2125	4 (8)	4.0 GHz	4.5 GHz	4.4 GHz							444ドル
Xeon W‐2133	6 (12)	3.6 GHz	3.9 GHz	3.8 GHz					140 W		617ドル
Xeon W‐2135	6 (12)	3.7 GHz	4.5 GHz	4.4 GHz					140 W		835ドル
Xeon W‐2140B*	8 (16)	3.2 GHz	4.2 GHz	3.8 GHz			11		120 W		N/A
Xeon W‐2145	8 (16)	3.7 GHz	4.5 GHz	4.3 GHz			11		140 W		1113ドル
Xeon W‐2155	10 (20)	3.3 GHz	4.5 GHz	4.0 GHz			13.75			Q4'17	1440ドル
Xeon W‐2175	14 (28)	2.5 GHz	4.3 GHz	3.3 GHz			19.25			Q4'17	1950ドル
Xeon W‐2195	18 (36)	2.3 GHz	4.3 GHz	3.2 GHz			24.75			Q3'17	2553ドル

(* = OEM CPU found in Apple Mac Pro with lower TDP)

Cascade Lake-W

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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 ×ばつ DDR4‐2666 up to 1 TB	1 MB per core	8.25	48	120 W	Q4'19	297ドル
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ドル
Xeon W-2235	6 (12)	3.8 GHz	4.6 GHz	4.3 GHz						130 W		555ドル
Xeon W-2245	8 (16)	3.9 GHz	4.5 GHz	4.5 GHz	4.7 GHz			16.5		155 W		667ドル
Xeon W-2255	10 (20)	3.7 GHz	4.5 GHz	4.3 GHz	4.7 GHz			19.25		165 W		778ドル
Xeon W-2265	12 (24)	3.5 GHz	4.6 GHz	4.3 GHz	4.8 GHz							944ドル
Xeon W-2275	14 (28)	3.3 GHz		4.1 GHz								1112ドル
Xeon W-2295	18 (36)	3.0 GHz		3.8 GHz				24.75				1333ドル

References

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^ "First Intel Core X-Series Processors Pre-Orders Begin Today, Available Starting June 26". Intel Newsroom. Retrieved 2020年05月18日.
^ "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. Archived from the original on June 2, 2017.

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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

Mobile Module Connector (1997)
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) 4710 (2024) 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)

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