Westmere (microarchitecture)

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.

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.
AES-NI instruction set support: 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.
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 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
Cache	Page size
Name	Level	4 KB	2 MB	1 GB
DTLB	1st	64	32	—N/a
ITLB	1st	128	7 / logical core	—N/a
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)	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

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.
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	MP Server	10 (20)	LGA 1567	Xeon	E7-8870	2.4 GHz	—N/a	Yes	130 W	4× QPI 6.4 GT/s	4× DDR3-1066	30 MB	2011-04-05	$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	4.4 GHz	—N/a	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	UP Server	6 (12)	Xeon	W3690	3.46 GHz	—N/a	Yes	130 W	1× QPI 6.4 GT/s	3× DDR3-1333	12 MB	2011-02-13	$999
W3680	3.33 GHz	2010-03-16	$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	UP Server	2 (4)	LGA 1156	Xeon	L3406	2.26 GHz	—N/a	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.

External links

2014-02-02 at the Wayback Machine (PDF)