Intel Core (client)
Westmere
Intel Westmere (2010) supports x86-64-v2.
- x86-64 level
- x86-64-v2
- Vendor
- Intel
- First products
- 2010
- Products
- Core i3, i5 and i7; Xeon 3600, 5600 and E7
- Segments
- GCC target
-march=westmere
Introduces AES-NI, which Intel did not enable on every model. GCC's -march=westmere leaves AES-NI out and adds it only at -march=skylake; this entry, and those built on it up to Broadwell, follow Intel's table of when each extension first appeared instead.
Product lines
| Product line | Segment | Socket | Source |
|---|---|---|---|
| Core i3 and i5 (Clarkdale) | desktop | LGA1156 | intel.com |
| Pentium (Clarkdale) | desktop | LGA1156 | intel.com |
| Xeon 3400 (Clarkdale) | server | LGA1156 | intel.com |
| Core i3, i5 and i7 (Arrandale) | mobile | rPGA988A, BGA1288 | intel.com |
| Core i3, i5 and i7 (Arrandale) | embedded | BGA1288 | intel.com |
| Pentium (Arrandale) | mobile | rPGA988A, BGA1288 | intel.com |
| Celeron (Arrandale) | mobile | rPGA988A, BGA1288 | intel.com |
| Core i7 and Core i7 Extreme (Gulftown)ARK lists it as Desktop; HEDT counts as workstation here. | workstation | LGA1366 | intel.com |
| Xeon 3600 | server | LGA1366 | intel.com |
| Xeon 5600 | server | LGA1366 | intel.com |
| Xeon E7 | server | LGA1567 | intel.com |
Why not x86-64-v3?
Westmere lacks AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE and XSAVE, all of which x86-64-v3 requires.
Feature checklist
| Feature | Westmere | Enumerated by | Linux flag |
|---|---|---|---|
| x86-64-v1 | |||
| CMOV | Yes | CPUID.01H:EDX[15] | cmov |
| CX8 | Yes | CPUID.01H:EDX[8] | cx8 |
| FPU | Yes | CPUID.01H:EDX[0] | fpu |
| FXSR | Yes | CPUID.01H:EDX[24] | fxsr |
| MMX | Yes | CPUID.01H:EDX[23] | mmx |
| OSFXSR via FXSR | Yes | CPUID.01H:EDX[24] | fxsr |
| SCE | Yes | CPUID.80000001H:EDX[11] | syscall |
| SSE | Yes | CPUID.01H:EDX[25] | sse |
| SSE2 | Yes | CPUID.01H:EDX[26] | sse2 |
| x86-64-v2 | |||
| CMPXCHG16B | Yes | CPUID.01H:ECX[13] | cx16 |
| LAHF-SAHF | Yes | CPUID.80000001H:ECX[0] | lahf_lm |
| POPCNT | Yes | CPUID.01H:ECX[23] | popcnt |
| SSE3 | Yes | CPUID.01H:ECX[0] | pni |
| SSE4.1 | Yes | CPUID.01H:ECX[19] | sse4_1 |
| SSE4.2 | Yes | CPUID.01H:ECX[20] | sse4_2 |
| SSSE3 | Yes | CPUID.01H:ECX[9] | ssse3 |
| x86-64-v3 | |||
| AVX | No | CPUID.01H:ECX[28] | avx |
| AVX2 | No | CPUID.(EAX=07H,ECX=0):EBX[5] | avx2 |
| BMI1 | No | CPUID.(EAX=07H,ECX=0):EBX[3] | bmi1 |
| BMI2 | No | CPUID.(EAX=07H,ECX=0):EBX[8] | bmi2 |
| F16C | No | CPUID.01H:ECX[29] | f16c |
| FMA | No | CPUID.01H:ECX[12] | fma |
| LZCNT | No | CPUID.80000001H:ECX[5] | abm |
| MOVBE | No | CPUID.01H:ECX[22] | movbe |
| OSXSAVE via XSAVE | No | CPUID.01H:ECX[26] | xsave |
| x86-64-v4 | |||
| AVX512F | No | CPUID.(EAX=07H,ECX=0):EBX[16] | avx512f |
| AVX512BW | No | CPUID.(EAX=07H,ECX=0):EBX[30] | avx512bw |
| AVX512CD | No | CPUID.(EAX=07H,ECX=0):EBX[28] | avx512cd |
| AVX512DQ | No | CPUID.(EAX=07H,ECX=0):EBX[17] | avx512dq |
| AVX512VL | No | CPUID.(EAX=07H,ECX=0):EBX[31] | avx512vl |
Other extensions
Notable extensions outside the x86-64 levels. Vendors sometimes disable these on individual models. Linked names lead to the extension's instructions.
Known vulnerabilities
The CVEs that the sources of the vulnerability list name as affecting Westmere, in all of its models or in some of them.
- CVE-2019-11091 Microarchitectural Data Sampling: Microarchitectural Data Sampling Uncacheable Memory
- CVE-2019-1125 Spectre variant 1: Spectre v1 swapgs
- CVE-2018-12207 iTLB multihit: Machine Check Error Avoidance on Page Size Change
- CVE-2018-12130 Microarchitectural Data Sampling: Microarchitectural Fill Buffer Data Sampling
- CVE-2018-12127 Microarchitectural Data Sampling: Microarchitectural Load Port Data Sampling
- CVE-2018-12126 Microarchitectural Data Sampling: Microarchitectural Store Buffer Data Sampling
- CVE-2018-3646 L1 Terminal Fault: L1 Terminal Fault: virtualization
- CVE-2018-3639 Speculative Store Bypass
- CVE-2018-3620 L1 Terminal Fault: L1 Terminal Fault: operating systems and SMM
- CVE-2018-3615 L1 Terminal Fault: L1 Terminal Fault: SGX
- CVE-2017-5754 Meltdown: Rogue Data Cache Load
- CVE-2017-5753 Spectre variant 1: Bounds Check Bypass
- CVE-2017-5715 Spectre variant 2: Branch Target Injection
Other Intel Core (client) microarchitectures
- NetBurst (Prescott, Nocona) 2004 v1
- Core (Merom, Conroe) 2006 v1
- Penryn 2007 v1
- Nehalem 2008 v2
- Westmere 2010 v2
- Sandy Bridge 2011 v2
- Ivy Bridge 2012 v2
- Haswell 2013 v3
- Broadwell 2014 v3
- Skylake 2015 v3
- Kaby Lake 2016 v3
- Coffee Lake 2017 v3
- Cannon Lake 2018 v4
- Comet Lake 2019 v3
- Ice Lake (client) 2019 v4
- Tiger Lake 2020 v4
- Alder Lake 2021 v3
- Rocket Lake 2021 v4
- Raptor Lake 2022 v3
- Meteor Lake 2023 v3
- Arrow Lake 2024 v3
- Lunar Lake 2024 v3
- Panther Lake 2026 v3
- Nova Lake announced v4
Sources
- GCC -march=westmere feature set (PTA_WESTMERE)
- Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 1, 253665-093, Sections 2.1.18 and 2.1.19: The 2010 Core i7, i5 and i3 processors and the Xeon 5600 series are based on Westmere.
- Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 4, 335592-093, Table 2-1: Models 06_25H, 06_2CH and 06_2FH: Core i7, i5 and i3, Xeon 3600, 5600 and E7.
- Intel ARK: Products formerly Westmere EP: Launch dates; the earliest is Q1'10 (Xeon X5680).
- Intel Advanced Encryption Standard (AES) New Instructions Set, white paper, May 2010: AES-NI begins with the 2010 Core processor family based on Westmere.
- Intel Core i3 Desktop Processors Comparison Chart: Lists the Core i3-530, i3-540, i3-550 and i3-560 without AES New Instructions.
- Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 1, 253665-093, Table 5-2: The AES-NI and PCLMULQDQ row names the Xeon E7, X3600 and X5600 series and the Core i7 980X as the first processors with them.
- GCC gcc/config/i386/i386.h: PTA_WESTMERE without PTA_AES, which PTA_SKYLAKE adds
- Intel ARK: Products formerly Clarkdale (archived December 2024): Lists the Core i3-530 to i3-560, the Core i5-650 to i5-680, the Pentium G6950, G6951 and G6960 and the Xeon L3406.
- Intel ARK: Products formerly Arrandale (archived February 2025): Lists the mobile Core i3, i5 and i7 M, LM and UM models, the embedded Core i3-330E, i5-520E, i7-610E, i7-620LE, i7-620UE and i7-660UE, the Pentium P6000 to P6300, U5400 and U5600 and the Celeron P4500, P4505, P4600, U3400, U3405 and U3600.
- Intel ARK: Products formerly Gulftown (archived February 2025): Lists the Core i7-970 and i7-980, the Core i7-980X and i7-990X Extreme Edition and the Xeon W3690.