Clarkdale is the codename for Intel's first-generation Core i5, i3 and Pentium dual-core desktop processors.
[1] It is closely related to the mobile Arrandale processor; both use dual-core dies based on the 32 nm Westmere microarchitecture and have integrated Graphics, PCI Express and DMI links built-in.
Clarkdale is the successor of the Wolfdale used in desktop Intel Core 2, Celeron and Pentium Dual-Core processors.
Clarkdale processors are sold under the Intel Core, Pentium and Celeron brand names, with varying feature sets.
In addition, the Pentium and Celeron versions do not have SMT, and they can only use a reduced amount of third-level cache.