Westmere (microarchitecture)

For other uses, see Westmere (disambiguation).

Westmere (formerly Nehalem-C) is a CPU microarchitecture developed by Intel. It is a 32 nm die shrink of its predecessor, Nehalem, and shares the same CPU sockets with it. Some Westmere models have integrated graphics processors, branded as Intel HD Graphics, that support DirectX 10.1 and OpenGL 2.1 API.

Westmere

Topside of a Core i7-970
General information
Launched	January 7, 2010; 15 years ago (January 7, 2010)
Performance
Max. CPU clock rate	1.06 GHz to 4.40 GHz
QPI speeds	4.80 GT/s to 6.40 GT/s
DMI speeds	2.50 GT/s
Cache
L1 cache	64 KB per core
L2 cache	256 KB per core
L3 cache	2 to 30 MB shared
Architecture and classification
Microarchitecture	Nehalem
Instruction set	x86-16, IA-32, x86-64
Extensions	AES-NI, CLMUL MMX, SSE, SSE2, SSE3, SSSE3, SSE4, SSE4.1, SSE4.2 VT-x, VT-d
Physical specifications
Transistors	382M to 2600M 32nm
Cores	2-6 (4-10 Xeon)
GPUs	533 MHz to 900 MHz 177M 45nm (K0)
Sockets	LGA 1156 LGA 1366 LGA 1567 rPGA988A
Products, models, variants
Model	Core in, Xeon
History
Predecessor	Nehalem
Successor	Sandy Bridge
Support status
Unsupported

Connection of the GPU inside the Westmere microarchitecture

The first Westmere-based processors were released on January 7, 2010. They were labeled under Intel's Core, Pentium, Celeron, and Xeon brandings.

Technology

Westmere's feature improvements from Nehalem, as reported, include:

• Native six-core (Gulftown) and ten-core (Westmere-EX) processors.^[1]
• AES-NI instruction set support:^[2]
  • Out of the total seven new instructions, six implement the AES algorithm specifically, the remaining PCLMULQDQ instruction (see CLMUL instruction set) accelerates carry-less multiplication for use in cryptography and data compression.^[3]
• Integrated graphics, fabricated on a separate die using 45 nm process, and added onto the processor package, beside the CPU die, (for dual core Arrandale and Clarkdale only).
• Improved virtualization latency^[4] and support for VMX Unrestricted mode, allowing 16-bit guests to run in real mode and big real mode.
• Support for "Huge Pages" of 1 GB in size.

Translation lookaside buffer sizes ^[5]

Cache		Page size
Name	Level	4 KB	2 MB	1 GB
DTLB	1st	64	32	—
ITLB	1st	128	7 / logical core	—
STLB	2nd	512	none	none

CPU variants

Processing cores (memory interface)	Process	Die size	CPUID	Model	Stepping	Mobile	Desktop, UP server	DP server	MP server
Ten-Core (Quad-channel)[6]	32 nm	513 mm2	206F2	47	A2				Westmere-EX (80615)
Six-Core (Triple-Channel)	32 nm	248 mm2	206C0 (ES/QS), 206C1 (ES/QS), 206C2	44	A0, B0, B1		Gulftown (80613)	Westmere-EP (80614)
Dual-Core (Dual-Channel, PCIe, Graphics Core)	32 nm 45 nm (Integrated Graphics)	114 mm2 +81 mm2	20652 20655	37	C2 K0	Arrandale (80617)	Clarkdale (80616)

Westmere CPUs

Intel Xeon E7-2850 die shot (Westmere-EX)

• TDP includes the integrated GPU, if present.
• Clarkdale processors feature 16 PCIe 2.0 lanes, which can be used in 1x16 or 2x8 configuration.
• Clarkdale and Arrandale contain the 32 nm dual core processor Hillel and the 45 nm integrated graphics device Ironlake, and support switchable graphics.^[7][8]
• Only certain higher-end CPUs support AES-NI and 1GB Huge Pages.

Server / Desktop processors

Codename	Market	Cores / threads	Socket	Processor branding & model		Clock rate		Turbo	TDP	Interfaces		L3 cache	Release date	Price
						Core	GPU			Chipset	Memory
Westmere-EX[9]	MP Server	10 (20)	LGA 1567	Xeon	E7-8870	2.4 GHz	—	Yes	130 W	4× QPI 6.4 GT/s	4× DDR3-1066	30 MB	2011-04-05[10]	$4616
					E7-4870									$4394
					E7-2870									$4227
					E7-8867L	2.13 GHz			105 W					$4172
					E7-8860	2.26 GHz			130 W			24 MB		$4061
					E7-4860									$3838
					E7-2860									$3670
					E7-8850	2 GHz								$3059
					E7-4850									$2837
					E7-2850									$2558
		8 (8)			E7-8837	2.66 GHz								$2280
		8 (16)			E7-8830	2.13 GHz			105 W
					E7-4830									$2059
					E7-2830									$1779
					E7-4820	2 GHz				4× QPI 5.86 GT/s		18 MB		$1446
					E7-2820									$1334
		6 (12)			E7-4807	1.86 GHz		No	95 W	4× QPI 4.8 GT/s	4× DDR3-800			$890
					E7-2803	1.73 GHz			105 W					$774
Westmere-EP	DP Server	2 (4)	LGA 1366	Xeon	X5698[11]	4.4 GHz	—	No	130 W	2× QPI 6.4 GT/s	3× DDR3-1333	12 MB	Q1 2011	OEM
		6 (12)			X5690	3.46 GHz		Yes					2011-02-13	$1663
					X5680	3.33 GHz							2010-03-16
					X5679	3.2 GHz			115 W				2011-02-13	OEM
					X5675	3.06 GHz			95 W					$1440
					X5670	2.93 GHz							2010-03-16
					X5660	2.8 GHz								$1219
					X5650	2.66 GHz								$996
					E5649	2.53 GHz			80 W	2× QPI 5.86 GT/s			2011-02-13	$774
					E5645	2.4 GHz							2010-03-16	$551
					L5645				60 W				2011-02-13	OEM
					L5640	2.26 GHz							2010-03-16	$996
					L5639	2.13 GHz							2011-02-13	OEM
					L5638	2.0 GHz							2010-03-16	$958
		4 (8)			X5687	3.6 GHz			130 W	2× QPI 6.4 GT/s			2011-02-13	$1663
					X5677	3.46 GHz							2010-03-16
					X5672	3.2 GHz			95 W				2011-02-13	$1440
					X5667	3.06 GHz							2010-03-16
					X5647	2.93 GHz			130 W	2× QPI 5.86 GT/s	3× DDR3-1066		2011-02-13	$774
					E5640	2.66 GHz			80 W				2010-03-16
					E5630	2.53 GHz								$551
					E5620	2.4 GHz								$387
					L5630	2.13 GHz			40 W					$551
					L5618	1.86 GHz								$530
		4 (4)			L5609	1.86 GHz		No		2× QPI 4.8 GT/s				$440
					E5607	2.26 GHz			80 W			8 MB	2011-02-13	$276
					E5606	2.13 GHz								$219
					E5603	1.6 GHz						4 MB		$188
Gulftown[12]	UP Server	6 (12)		Xeon	W3690	3.46 GHz	—	Yes	130 W	1× QPI 6.4 GT/s	3× DDR3-1333	12 MB	2011-02-13[13]	$999
					W3680	3.33 GHz							2010-03-16[14]	$999
					W3670	3.20 GHz				1× QPI 4.8 GT/s	3× DDR3-1066		2010-08-29	$885
	Extreme / Performance Desktop			Core i7 Extreme	990X	3.46 GHz				1× QPI 6.4 GT/s			2011-02-13	$999
					980X	3.33 GHz							2010-03-16
				Core i7	980					1× QPI 4.8 GT/s			2011-06-26	$583
					970	3.20 GHz							2010-07-17	$583
Clarkdale[15]	UP Server	2 (4)	LGA 1156	Xeon	L3406	2.26 GHz	—	Yes	30 W	DMI	2× DDR3-1066	4 MB	2010-03-16	$189
		2 (2)			L3403	2.0 GHz							2010-10	OEM
	Mainstream / Value Desktop	2 (4)		Core i5	680	3.6 GHz	733 MHz		73 W		2× DDR3-1333		2010-04-18	$294
					670	3.46 GHz							2010-01-07	$284
					661	3.33 GHz	900 MHz		87 W					$196
					660		733 MHz		73 W
					655K	3.2 GHz							2010-05-30	$216
					650								2010-01-07	$176
				Core i3	560	3.33 GHz		No					2010-08-29	$138
					550	3.20 GHz							2010-05-30
					540	3.06 GHz							2010-01-07	$133
					530	2.93 GHz								$113
		2 (2)		Pentium	G6960		533 MHz				2× DDR3-1066	3 MB	2011-01-09	$89
					G6951	2.8 GHz							Q3 2010	OEM
					G6950								2010-01-07	$87
				Celeron	G1101	2.26 GHz						2 MB		$70
Codename	Market	Cores / Threads	Socket	Processor Branding & model		Core	GPU	Turbo	TDP	Chipset	Memory	L3 cache	Release Date	Price
						Clock rate				Interfaces

Mobile processors

Codename	Market	Cores / threads	Processor branding & model		CPU Clock rate		GPU clock rate	Turbo	TDP	Memory	L3 cache	Interface	Release date	Price
					Standard	Turbo (1C/2C active cores )
Arrandale	Mainstream / Value Mobile	2 (4)	Core i7	640M	2.8 GHz	3.46/3.2 GHz	766 MHz	Yes	35 W	2× DDR3-1066	4 MB	* DMI * PCIe 1 x16 * Socket: μPGA-988 / BGA-1288	2010-09-26	$346
				620M	2.66 GHz	3.33/3.06 GHz							2010-01-07	$332
				610E	2.53 GHz	3.2/2.93 GHz
				660LM	2.26 GHz	3.06/2.8 GHz	566 MHz		25 W				2010-09-26	$346
				640LM	2.13 GHz	2.93/2.66 GHz							2010-01-07	$332
				620LM / 620LE	2.0 GHz	2.8/2.53 GHz								$300
				680UM	1.46 GHz	2.53/2.16 GHz	500 MHz		18 W	2× DDR3-800			2010-09-26	$317
				660UM / 660UE	1.33 GHz	2.4/2.0 GHz							2010-05-25
				640UM	1.2 GHz	2.26/1.86 GHz							2010-01-07	$305
				620UM / 620UE	1.06 GHz	2.13/1.76 GHz								$278
			Core i5	580M	2.66 GHz	3.33/2.93 GHz	766 MHz		35 W	2× DDR3-1066	3 MB		2010-09-26	$266
				560M		3.2/2.93 GHz								$225
				540M	2.53 GHz	3.06/2.8 GHz							2010-01-07	$257
				520M / 520E	2.4 GHz	2.93/2.66 GHz								$225
				560UM	1.33 GHz	2.13/1.86 GHz	500 MHz		18 W	2× DDR3-800			2010-09-26	$250
				540UM	1.2 GHz	2.0/1.73 GHz							2010-05-25
				520UM	1.06 GHz	1.86/1.6 GHz							2010-01-07	$241
				480M	2.66 GHz	2.93/2.93 GHz	766 MHz		35 W	2× DDR3-1066			2011-01-09	OEM
				460M	2.53 GHz	2.8/2.8 GHz							2010-09-26
				450M	2.4 GHz	2.66/2.66 GHz							2010-06-26
				430M	2.26 GHz	2.53/2.53 GHz							2010-01-07
				470UM	1.33 GHz	1.86/1.6 GHz	500 MHz		18 W	2× DDR3-800			2010-10-01
				430UM	1.2 GHz	1.73/1.46 GHz							2010-05-25
			Core i3	390M	2.66 GHz	n/a	667 MHz	No	35 W	2× DDR3-1066			2011-01-09
				380M	2.53 GHz								2010-09-26
				370M	2.4 GHz								2010-06-20
				350M	2.26 GHz								2010-01-07
				330M / 330E	2.13 GHz
				380UM	1.33 GHz		500 MHz		18 W	2× DDR3-800			2010-10-01
				330UM	1.2 GHz								2010-05-25
		2 (2)	Pentium	P6300	2.26 GHz		667 MHz		35 W	2× DDR3-1066			2011-01-09
				P6200	2.13 GHz								2010-09-26
				P6100	2.0 GHz
				P6000	1.86 GHz								2010-06-20
				U5600	1.33 GHz		500 MHz		18 W	2× DDR3-800			2011-01-09
				U5400	1.2 GHz								2010-05-25
			Celeron	P4600	2.0 GHz		667 MHz		35 W	2× DDR3-1066	2 MB		2010-09-26	$86
				P4500 / P4505	1.86 GHz								2010-03-28	OEM
				U3600	1.2 GHz		500 MHz		18 W	2× DDR3-800			2011-01-09	$134
				U3400 / U3405	1.06 GHz					2× DDR3-800 / 1066			2010-05-25	OEM

Roadmap

The successor to Nehalem and Westmere is Sandy Bridge.

See also

• List of Intel CPU microarchitectures
• Tick-Tock model