Clarkdale (microprocessor)

Clarkdale is the code name for an Intel processor, initially sold as desktop Intel Core i5 and Core i3 and Pentium.[1] It is closely related to the mobile Arrandale processor; both use dual-core dies based on the Westmere 32 nm die shrink of the Nehalem microarchitecture, and have integrated Graphics as well as PCI Express and DMI links.

Clarkdale
General information
LaunchedJanuary 7, 2010
Designed byIntel
CPUID code02065x
Product code80616
Performance
Max. CPU clock rate2.27 GHz to 3.6 GHz
Cache
L2 cache2×256 KB
L3 cache4 MB
Architecture and classification
ApplicationDesktop
Min. feature size32 nm
MicroarchitectureWestmere
Instruction setx86, x86-64, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AES-NI
Physical specifications
Cores
  • 2
Socket(s)
Products, models, variants
Brand name(s)

Clarkdale is the successor of the 45 nm Core microarchitecture-based Wolfdale processor that is used in the many desktop Intel Core 2, Celeron and Pentium Dual-Core processors. While Wolfdale typically used both a north bridge and a south bridge, Clarkdale already contains the major north bridge components, which are the memory controller, PCI Express for external graphics, integrated graphics and the DMI connector, making it possible to build more compact systems without a separate northbridge or discrete graphics as Lynnfield.

The Clarkdale processor package contains two dies: the 32 nm processor die with the I/O connections, and the 45 nm graphics and integrated memory controller die.[2] Physical separation of the processor die and memory controller die resulted in increased memory latency.

The CPUID for Clarkdale is family 6, model 37 (2065x). The mobile equivalent of Clarkdale is Arrandale.

Brand names

Clarkdale processors are sold under the Intel Core, Pentium and Celeron brand names, with varying feature sets. The Core i5 versions generally have all features enabled, with the Core i5-661 and Core i5-655K models lacking Intel VT-d and TXT like the Core i3, which also does not support Turbo Boost and AES new instructions. In addition, the Pentium and Celeron versions do not have SMT, and they can only use a reduced amount of third-level cache.

The Xeon L340x line has a lower clock frequency and thermal design power, and supports unbuffered ECC memory in addition to the features of the Core i5-6xx, but has support for the integrated graphics disabled.

Importantly, although the memory controller in Clarkdale processors is on-package, it is on a separate die from the CPU cores, and thus has increased latency compared to processor architectures which integrate it on-die with the main CPU cores.[3]

Brand NameModel (list)LogoL3 Cache sizeThermal Design Power
Celeron G1xxx2 MB73 W
Pentium G6xxx3 MB
Core i3 i3-5xx4 MB
Core i5 i5-6xx73–87 W
Xeon L340x4 MB30 W

See also

References
  1. "Intel May Unveil Microprocessors with Integrated Graphics Cores at Consumer Electronics Show". X-bit labs. 2009-08-13. Retrieved 2014-01-15.
  2. "The Delayed Mobile Nehalems: Clarksfield, Arrandale, and the Calpella Platform". Brighthub.com. 2009-02-22. Retrieved 2014-01-15.
  3. Shimpi, Anand. "The Clarkdale Review: Intel's Core i5 661, i3 540 & i3 530". www.anandtech.com/. Retrieved 16 June 2014.
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