i3

Intel Core is a brand name used for various mid-range to high-end consumer and business microprocessors.
In general, processors sold as Core are more powerful variants of the same processors marketed as entry-level Celeron and Pentium. Similarly, identical or more capable versions of Core processors are also sold as Xeon processors for the server market.

The current lineup of Core processors includes the latest Intel Core i7, Intel Core i5 and Intel Core i3, and the older Intel Core 2 Solo, Intel Core 2 Duo, Intel Core 2 Quad and Intel Core 2 Extreme lines.^[1]

Brand	Desktop				Laptop
	Code-named	Cores	Fab	Date released	Code-named	Cores	Fab	Date released
Core Solo	Desktop version not available				Yonah	1	65 nm	Jan 2006
Core Duo	Desktop version not available				Yonah	2	65 nm	Jan 2006
Core 2 Solo	Desktop version not available				Merom-L Penryn-3M	1 1	65 nm 45 nm	Sep 2007 May 2008
Core 2 Duo	Conroe Allendale Wolfdale	2 2 2	65 nm 65 nm 45 nm	Aug 2006 Jan 2007 Jan 2008	Merom Penryn	2 2	65 nm 45 nm	Jul 2006 Jan 2008
Core 2 Quad	Kentsfield Yorkfield	4 4	65 nm 45 nm	Jan 2007 Mar 2008	Penryn	4	45 nm	Aug 2008
Core 2 Extreme	Conroe XE Kentsfield XE Yorkfield XE	2 4 4	65 nm 65 nm 45 nm	Jul 2006 Nov 2006 Nov 2007	Merom XE Penryn XE Penryn XE	2 2 4	65 nm 45 nm 45 nm	Jul 2007 Jan 2008 Aug 2008
Core i3	Clarkdale	2	32 nm	Jan 2010	Arrandale	2	32 nm	Jan 2010
Core i5	Lynnfield Clarkdale	4 2	45 nm 32 nm	Sep 2009 Jan 2010	Arrandale	2	32 nm	Jan 2010
Core i7	Bloomfield Lynnfield Gulftown	4 4 6	45 nm 45 nm 32 nm	Nov 2008 Sep 2009 Jul 2010	Clarksfield Arrandale	4 2	45 nm 32 nm	Sep 2009 Jan 2010
Core i7 Extreme Edition	Bloomfield Gulftown	4 6	45 nm 32 nm	Nov 2008 March 2010	Clarksfield	4	45 nm	Sep 2009

The original Core brand refers to Intel's 32-bit mobile dual-core x86 CPUs that derived from the Pentium M branded processors. The processor family used a more enhanced version of the Intel P6 microarchitecture. It emerged in parallel with the NetBurst microarchitecture (Intel P68) of the Pentium 4 brand, and was a precursor of the 64-bit Core microarchitecture of Core 2 branded CPUs. The Core brand comprised two branches: the Duo (dual-core) and Solo (Duo with one disabled core, which replaced the Pentium M brand of single-core mobile processor).
The Core brand was launched on January 6, 2006 by the release of the 32-bit Yonah CPU – Intel's first dual-core mobile (low-power) processor. Its dual-core layout closely resembled two interconnected Pentium M branded CPUs packaged as a single die (piece) silicon chip (IC). Hence, the 32-bit microarchitecture of Core branded CPUs – contrary to its name – had more in common with Pentium M branded CPUs than with the subsequent 64-bit Core microarchitecture of Core 2 branded CPUs. Despite a major rebranding effort by Intel starting January 2006, some computers with the Yonah core continued to be marked as Pentium M.
The Core series is also known for being the first Intel processor to be used as the main CPU for an Apple Macintosh computer. The Core Duo was the CPU for the first generation Macbook Pro while the Core Solo appeared in Apple's Mac Mini line. Core Duo signified the beginning of Apple's shift to Intel processors across their entire line.
In 2007, Intel began branding the Yonah core CPUs intended for mainstream mobile computers as Pentium Dual-Core. These are not to be confused with the desktop 64-bit Core microarchitecture CPUs also branded as Pentium Dual-Core.
September 2007 and January 4, 2008 mark a discontinuation of many Core branded CPUs

The successor to Core is the mobile version of the Intel Core 2 line of processors using cores based upon the Intel Core microarchitecture,^[6] released on July 27, 2006. The release of the mobile version of Intel Core 2 marks the reunification of Intel's desktop and mobile product lines as Core 2 processors were released for desktops and notebooks, unlike the first Intel Core CPUs that were targeted only for notebooks (although some small form factor and all-in-one desktops, like the iMac and the Mac Mini, also used Core processors).
Unlike the Intel Core, Intel Core 2 is a 64-bit processor, supporting Intel 64. Another difference between the original Core Duo and the new Core 2 Duo is an increase in the amount of Level 2 cache. The new Core 2 Duo has tripled the amount of on-board cache to 6 MB. Core 2 also introduced a quad-core performance variant to the single- and dual-core chips, branded Core 2 Quad, as well as an enthusiast variant, Core 2 Extreme. All three chips are manufactured at a 65 nm lithography, and in 2008, a 45 nm lithography and support Front Side Bus speeds ranging from 533 MHz to 1600 MHz. In addition, the 45 nm die shrink of the Core microarchitecture adds SSE4.1 support to all Core 2 microprocessors manufactured at a 45 nm lithography, therefore increasing the calculation rate of the processors.