|Produced||January 7, 2010|
|Max. CPU clock rate||2.8 GHz to 3.6 GHz|
|Min. feature size||32 nm|
|Instruction set||x86, x86-64, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AES-NI|
|L3 cache||4 MB|
Clarkdale is the code name for an Intel processor, initially sold as desktop Intel Core i5 and Core i3 and Pentium. 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 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 actual 32 nm processor with the I/O connections, and
- the 45 nm graphics controller with the memory interface (GMCH).
Physical separation of the processor and GMCH meant increased memory latency.
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 only the Core i5-661 model lacking Intel VT-d and TXT like the Core i3, which also does not support Turbo Boost and the 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's on a separate die from the CPU cores, and thus has increased latency compared to processor architecures which integrate it on-die with the main CPU cores.
|Brand Name||Model (list)||Logo||L3 Cache size||Thermal Design Power|
|Celeron||G1xxx||2 MB||73 W|
|Core i3||i3-5xx||4 MB|
|Core i5||i5-6xx||73–87 W|
|Xeon||L340x||4 MB||30 W|
- "Intel May Unveil Microprocessors with Integrated Graphics Cores at Consumer Electronics Show". X-bit labs. 2009-08-13. Retrieved 2014-01-15.
- "The Delayed Mobile Nehalems: Clarksfield, Arrandale, and the Calpella Platform". Brighthub.com. 2009-02-22. Retrieved 2014-01-15.
- Shimpi, Anand. "The Clarkdale Review: Intel's Core i5 661, i3 540 & i3 530". http://www.anandtech.com/. Retrieved 16 June 2014.