Westmere (microarchitecture)

Last updated
General information
LaunchedJanuary 7, 2010;11 years ago (January 7, 2010)
Max. CPU clock rate 1.06 GHz to 3.46 GHz
L1 cache 64 KB per core
L2 cache256 KB per core
L3 cache4 MB to 30 MB shared
Architecture and classification
Architecture Nehalem x86
Instructions IA-32, x86-64
Physical specifications
  • 2-6 (4-10 Xeon)
GPU(s) 533 MHz to 900 MHz
177M 45nm (K0)
Products, models, variants
  • Core in, Xeon
Predecessor Nehalem
Successor Sandy Bridge
Connection of the GPU inside the Westmere microarchitecture Westmere (architettura).svg
Connection of the GPU inside the Westmere microarchitecture

Westmere (formerly Nehalem-C) is the code name given to the 32 nm die shrink of Nehalem . While sharing the same CPU sockets, Westmere included Intel HD Graphics, while Nehalem did not.


The first Westmere-based processors were launched on January 7, 2010, by Intel Corporation.

The Westmere architecture has been available under the Intel brands of Core i3, Core i5, Core i7, Pentium, Celeron and Xeon.


Westmere's feature improvements from Nehalem, as reported:

Translation lookaside buffer sizes [5]
CachePage Size
NameLevel4 KB2 MB1 GB
ITLB1st1287 / logical coreN/A

CPU variants

Processing Cores
ProcessDie SizeCPUIDModelSteppingMobileDesktop,
UP Server
DP ServerMP Server
(Quad-channel) [6]
32 nm513 mm²206F247A2 Westmere-EX
32 nm248 mm²206C0 (ES/QS),
206C1 (ES/QS),
Dual-Core (Dual-Channel,
PCIe, Graphics Core)
32 nm
45 nm
114 mm²
+81 mm²

Westmere CPUs

Server / Desktop processors

CodenameMarket Cores /
Socket Processor
Branding & model
Clock rate Turbo TDPInterfaces L3
Westmere-EX [9] MP Server10 (20)LGA
XeonE7-88702.4 GHzN/AYes130 W4× QPI 6.4 GT/s4× DDR3-106630 MB2011-04-05 [10] $4616
E7-8867L2.13 GHz105 W$4172
E7-88602.26 GHz130 W24 MB$4061
E7-88502 GHz$3059
8 (8)E7-88372.66 GHz$2280
8 (16)E7-88302.13 GHz105 W
E7-48202 GHz4× QPI 5.86 GT/s18 MB$1446
6 (12)E7-48071.86 GHzNo95 W4× QPI 4.8 GT/s4× DDR3-800$890
E7-28031.73 GHz105 W$774
Gulftown /
DP Server2 (4)LGA
XeonX5698 [12] 4.4 GHzN/ANo130 W2× QPI 6.4 GT/s3× DDR3-133312 MBQ1 2011OEM
6 (12)X56903.46 GHzYes2011-02-13$1663
X56803.33 GHz2010-03-16
X56793.2 GHz115 W2011-02-13OEM
X56753.06 GHz95 W$1440
X56702.93 GHz2010-03-16
X56602.8 GHz$1219
X56502.66 GHz$996
E56492.53 GHz80 W2× QPI 5.86 GT/s2011-02-13$774
E56452.4 GHz2010-03-16$551
L564560 W2011-02-13OEM
L56402.26 GHz2010-03-16$996
L56392.13 GHz2011-02-13OEM
L56382.0 GHz2010-03-16$958
4 (8)X56873.6 GHz130 W2× QPI 6.4 GT/s2011-02-13$1663
X56773.46 GHz2010-03-16
X56723.2 GHz95 W2011-02-13$1440
X56673.06 GHz2010-03-16
X56472.93 GHz130 W2× QPI 5.86 GT/s3× DDR3-10662011-02-13$774
E56402.66 GHz80 W2010-03-16
E56302.53 GHz$551
E56202.4 GHz$387
L56302.13 GHz40 W$551
L56181.86 GHz$530
4 (4)L56091.86 GHzNo2× QPI 4.8 GT/s$440
E56072.26 GHz80 W8 MB2011-02-13$276
E56062.13 GHz$219
E56031.6 GHz4 MB$188
UP Server6 (12)XeonW36903.46 GHzN/AYes130 W1× QPI 6.4 GT/sDDR3-133312 MB2011-02-13 [13] $999
W36803.33 GHz2010-03-16 [14] $999
W36703.20 GHz1× QPI 4.8 GT/s3× DDR3-10662010-08-29$885
Extreme /
Core i7
990X3.46 GHz1× QPI 6.4 GT/s2011-02-13$999
980X3.33 GHz2010-03-16
Core i79801× QPI 4.8 GT/s2011-06-26$583
9703.20 GHz2010-07-17$583
Clarkdale [15] UP Server2 (4)LGA
XeonL34062.26 GHzN/AYes30 W DMI 2× DDR3-10664 MB2010-03-16$189
2 (2)L34032.0 GHz2010-10$
Mainstream /
2 (4)Core i56803.6 GHz733 MHz73 W2× DDR3-13332010-04-18$294
6703.46 GHz2010-01-07$284
6613.33 GHz900 MHz87 W$196
660733 MHz73 W
655K3.2 GHz2010-05-30$216
Core i35603.33 GHzNo2010-08-29$138
5503.20 GHz2010-05-30
5403.06 GHz2010-01-07$133
5302.93 GHz$113
2 (2)PentiumG6960533 MHz2× DDR3-10663 MB2011-01-09$89
G69512.8 GHzQ3 2010OEM
CeleronG11012.26 GHz2 MB$70
CodenameMarketCores /
Branding & model
Clock rateInterfaces

Mobile processors

CodenameMarket Cores /
Branding & Model
CPU Clock rate GPU Clock rate Turbo TDPMemory L3
Standard Turbo
(1C/2C active cores )
ArrandaleMainstream /

Value Mobile

2 (4)Core i7640M2.8 GHz3.46/3.2 GHz766 MHzYes35 W2× DDR3-10664 MB* DMI
* PCIe 1 x16
* Socket:
µPGA-988 /
620M2.66 GHz3.33/3.06 GHz2010-01-07$332
610E2.53 GHz3.2/2.93 GHz
660LM2.26 GHz3.06/2.8 GHz566 MHz25 W2010-09-26$346
640LM2.13 GHz2.93/2.66 GHz2010-01-07$332
620LM / 620LE2.0 GHz2.8/2.53 GHz$300
680UM1.46 GHz2.53/2.16 GHz500 MHz18 W2× DDR3-8002010-09-26$317
660UM / 660UE1.33 GHz2.4/2.0 GHz2010-05-25
640UM1.2 GHz2.26/1.86 GHz2010-01-07$305
620UM / 620UE1.06 GHz2.13/1.76 GHz$278
Core i5580M2.66 GHz3.33/2.93 GHz766 MHz35 W2× DDR3-10663 MB2010-09-26$266
560M3.2/2.93 GHz$225
540M2.53 GHz3.06/2.8 GHz2010-01-07$257
520M / 520E2.4 GHz2.93/2.66 GHz$225
560UM1.33 GHz2.13/1.86 GHz500 MHz18 W2× DDR3-8002010-09-26$250
540UM1.2 GHz2.0/1.73 GHz2010-05-25
520UM1.06 GHz1.86/1.6 GHz2010-01-07$241
480M2.66 GHz2.93/2.93 GHz766 MHz35 W2× DDR3-10662011-01-09OEM
460M2.53 GHz2.8/2.8 GHz2010-09-26
450M2.4 GHz2.66/2.66 GHz2010-06-26
430M2.26 GHz2.53/2.53 GHz2010-01-07
470UM1.33 GHz1.86/1.6 GHz500 MHz18 W2× DDR3-8002010-10-01
430UM1.2 GHz1.73/1.46 GHz2010-05-25
Core i3390M2.66 GHzn/a667 MHzNo35 W2× DDR3-10662011-01-09
380M2.53 GHz2010-09-26
370M2.4 GHz2010-06-20
350M2.26 GHz2010-01-07
330M / 330E2.13 GHz
380UM1.33 GHz500 MHz18 W2× DDR3-8002010-10-01
330UM1.2 GHz2010-05-25
2 (2)PentiumP63002.26 GHz667 MHz35 W2× DDR3-10662011-01-09
P62002.13 GHz2010-09-26
P61002.0 GHz
P60001.86 GHz2010-06-20
U56001.33 GHz500 MHz18 W2× DDR3-8002011-01-09
U54001.2 GHz2010-05-25
CeleronP46002.0 GHz667 MHz35 W2× DDR3-10662 MB2010-09-26$86
P4500 / P45051.86 GHz2010-03-28OEM
U36001.2 GHz500 MHz18 W2× DDR3-8002011-01-09$134
U3400 / U34051.06 GHz2× DDR3-800 / 10662010-05-25OEM


The successor to Nehalem and Westmere is Sandy Bridge .

See also

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