Lynnfield (microprocessor)

Lynnfield is the code name for a quad-core processor from Intel released in September 2009. It was sold in varying configurations as Core i5-7xx, Core i7-8xx or Xeon X34xx. Lynnfield uses the Nehalem microarchitecture and replaces the earlier Penryn based Wolfdale and Yorkfield processors, using the same 45 nm process technology, but with a new memory and bus interface. The product code for Lynnfield is 80605, its CPUID value identifies it as family 6, model 30 (0106Ex).

Lynnfield

General information
Launched	2009
Marketed by	Intel
Designed by	Intel
Common manufacturer	Intel
CPUID code	106Ex
Product code	80605
Performance
Max. CPU clock rate	2.40 GHz to 3.73 GHz
DMI speeds	2 GT/s
Cache
L1 cache	64 KB per core (32 KB data + 32 KB instructions)
L2 cache	1 MB (256 KB per core)
L3 cache	8 MB
Architecture and classification
Application	Desktop
Technology node	45 nm (774 million transistors)
Microarchitecture	Nehalem
Instruction set	x86, x86-64, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2
Physical specifications
Transistors	774 million
Cores	4
Memory (RAM)	Up to 32 GB Up to DDR3-1333
Socket	LGA 1156
Products, models, variants
Brand names	Core i5-7xx Core i5-7xxS Core i7-8xx Core i7-8xxS Core i7-8xxK Xeon X34xx Xeon L34xx
History
Predecessors	Wolfdale Yorkfield
Successor	Sandy Bridge
Support status
Unsupported

Lynnfield is related to the earlier Bloomfield and Gainestown microprocessors, which are used in server and high-end desktop systems. The main difference between the two is Lynnfield's use of the LGA 1156 processor socket as opposed to the LGA 1366 socket used by Bloomfield and Gainestown processors. LGA 1156 processors include Direct Media Interface and PCI Express links, which Intel has previously connected to the processor with a dedicated northbridge chip, called the memory controller hub or I/O hub.

The Lynnfield series of processors does not include built-in Intel graphics.

The mobile version of Lynnfield is Clarksfield. The dual-core version was going to be Havendale, but it was cancelled in favor of Clarkdale.

Brand names

Brand name	Model (list)	Market	Clock frequency range	HT	ECC RAM/Max. RAM
Core i5	i5-7xx	Performance desktop	2.67–2.80 GHz	No	No/16 (32 unofficially) GB
	i5-7xxS		2.40 GHz
Core i7	i7-8xx		2.80–3.07 GHz	Yes
	i7-875K		2.93 GHz (unlocked)
	i7-8xxS		2.53–2.67 GHz
Xeon	X34xx	UP server	1.86–3.07 GHz	some	Yes/32 GB

See also

• Nehalem (microarchitecture)
• Yorkfield (microprocessor)
• Clarksfield (microprocessor)
• Clarkdale (microprocessor)
• List of Macintosh models grouped by CPU type

External links

• Intel's Lynnfield Processor & its New Power Control Unit