LGA 1366 socket: CPU list (including Xeon) and specifications

Socket 1366, also known as LGA 1366, is a CPU socket used by Intel for its high-end desktop and server processors. It was introduced in 2008 and was the successor to Socket 775. Socket 1366 was used by Intel’s Core i7, Xeon 5500, and Xeon 5600 series processors.

One of the most notable features of Socket 1366 is its support for triple-channel DDR3 memory. This allowed for faster memory access and better system performance. Socket 1366 also supported Intel’s QuickPath Interconnect (QPI), which allowed for faster communication between the CPU and other system components such as the memory and input/output devices.

Socket LGA 1366 for its high-end desktop and server processors — Close-up of a Socket LGA 1366 CPU socket on a motherboard

However, despite its many advantages, Socket 1366 has now been largely replaced by newer CPU sockets such as LGA 2011 and LGA 2066. These newer sockets offer support for newer CPUs with better performance and power efficiency.

List of LGA 1366 processors

Processor Model	Cores	Threads	Max Frequency	Base Frequency	Cache	TDP	Memory Types	Process	Launch Date
Intel Core i7-990X Extreme Edition	6	12	3.73 GHz	3.46 GHz	12 MB	130W	DDR3 1066	32 nm	2011
Intel Core i7-980X Extreme Edition	6	12	3.60 GHz	3.33 GHz	12 MB	130W	DDR3 1066	32 nm	2010
Intel Core i7-980	6	12	3.60 GHz	3.33 GHz	12 MB	130W	DDR3 1066	32 nm	2011
Intel Core i7-970	6	12	3.46 GHz	3.20 GHz	12 MB	130W	DDR3 800/1066	32 nm	2010
Intel Core i7-975 Extreme Edition	4	8	3.60 GHz	3.33 GHz	8 MB	130W	DDR3 800/1066	45 nm	2009
Intel Core i7-965 Extreme Edition	4	8	3.46 GHz	3.20 GHz	8 MB	130W	DDR3 800/1066	45 nm	2008
Intel Core i7-960	4	8	3.46 GHz	3.20 GHz	8 MB	130W	DDR3 800/1066	45 nm	2009
Intel Core i7-950	4	8	3.33 GHz	3.06 GHz	8 MB	130W	DDR3 800/1066	45 nm	2009
Intel Core i7-940	4	8	3.20 GHz	2.93 GHz	8 MB	130W	DDR3 800/1066	45 nm	2008
Intel Core i7-930	4	8	3.06 GHz	2.80 GHz	8 MB	130W	DDR3 800/1066	45 nm	2010
Intel Core i7-920	4	8	2.93 GHz	2.66 GHz	8 MB	130W	DDR3 800/1066	45 nm	2008

List of Xeon CPUs for LGA 1366

Process model	Cores	Threads	Base Frequency	Max Frequency	Cache	TDP	Memory Types	Process	Launch Date
Intel Xeon X5680	6	12	3.33 GHz	3.60 GHz	12 MB	130W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon W3680	6	12	3.33 GHz	3.60 GHz	12 MB	130W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon W3670	6	12	3.20 GHz	3.46 GHz	12 MB	130W	DDR3 800/1066	32 nm	2010
Intel Xeon X5670	6	12	2.93 GHz	3.33 GHz	12 MB	95W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon X5660	6	12	2.80 GHz	3.20 GHz	12 MB	95W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon X5650	6	12	2.66 GHz	3.06 GHz	12 MB	95W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon L5640	6	12	2.26 GHz	2.80 GHz	12 MB	60W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon L5638	6	12	2.00 GHz	2.40 GHz	12 MB	60W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon E5645	6	12	2.40 GHz	2.67 GHz	12 MB	80W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon X5690	6	12	3.46 GHz	3.73 GHz	12 MB	130W	DDR3 800/1066/1333	32 nm	2011
Intel Xeon X5675	6	12	3.06 GHz	3.46 GHz	12 MB	95W	DDR3 800/1066/1333	32 nm	2011
Intel Xeon E5649	6	12	2.53 GHz	2.93 GHz	12 MB	80W	DDR3 800/1066/1333	32 nm	2011
Intel Xeon W3690	6	12	3.46 GHz	3.73 GHz	12 MB	130W	DDR3 800/1066/1333	32 nm	2011
Intel Xeon E5530	4	8	2.40 GHz	2.66 GHz	8 MB	80W	DDR3 800/1066	45 nm	2009
Intel Xeon E5540	4	8	2.53 GHz	2.80 GHz	8 MB	80W	DDR3 800/1066	45 nm	2009
Intel Xeon X5550	4	8	2.66 GHz	3.06 GHz	8 MB	95W	DDR3 800/1066/1333	45 nm	2009
Intel Xeon X5560	4	8	2.80 GHz	3.20 GHz	8 MB	95W	DDR3 800/1066/1333	45 nm	2009
Intel Xeon X5570	4	8	2.93 GHz	3.33 GHz	8 MB	95W	DDR3 800/1066/1333	45 nm	2009
Intel Xeon W5580	4	8	3.20 GHz	3.46 GHz	8 MB	130W	DDR3 800/1066/1333	45 nm	2009
Intel Xeon W3520	4	8	2.66 GHz	2.93 GHz	8 MB	130W	DDR3 800/1066	45 nm	2009
Intel Xeon W3540	4	8	2.93 GHz	3.20 GHz	8 MB	130W	DDR3 800/1066	45 nm	2009
Intel Xeon W3550	4	8	3.06 GHz	3.33 GHz	8 MB	130W	DDR3 800/1066	45 nm	2009
Intel Xeon W3565	4	8	3.20 GHz	3.46 GHz	8 MB	130W	DDR3 800/1066	45 nm	2009
Intel Xeon W3570	4	8	3.20 GHz	3.46 GHz	8 MB	130W	DDR3 800/1066/1333	45 nm	2009
Intel Xeon W3580	4	8	3.33 GHz	3.60 GHz	8 MB	130W	DDR3 800/1066/1333	45 nm	2009
Intel Xeon E5520	4	8	2.26 GHz	2.53 GHz	8 MB	80W	DDR3 800/1066	45 nm	2009
Intel Xeon L5520	4	8	2.26 GHz	2.48 GHz	8 MB	60W	DDR3 800/1066	45 nm	2009
Intel Xeon W3530	4	8	2.80 GHz	3.06 GHz	8 MB	130W	DDR3 800/1066	45 nm	2010
Intel Xeon W5590	4	8	3.33 GHz	3.60 GHz	8 MB	130W	DDR3 800/1066/1333	45 nm	2009
Intel Xeon L5530	4	8	2.40 GHz	2.66 GHz	8 MB	60W	DDR3 800/1066	45 nm	2009
Intel Xeon X5667	4	8	3.06 GHz	3.46 GHz	12 MB	95W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon E5640	4	8	2.66 GHz	2.93 GHz	12 MB	80W	DDR3 800/1066	32 nm	2010
Intel Xeon E5630	4	8	2.53 GHz	2.80 GHz	12 MB	80W	DDR3 800/1066	32 nm	2010
Intel Xeon E5620	4	8	2.40 GHz	2.66 GHz	12 MB	80W	DDR3 800/1066	32 nm	2010
Intel Xeon L5630	4	8	2.13 GHz	2.40 GHz	12 MB	40W	DDR3 800/1066	32 nm	2010
Intel Xeon X5677	4	8	3.46 GHz	3.73 GHz	12 MB	130W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon L5618	4	8	1.87 GHz	2.26 GHz	12 MB	40W	DDR3 800/1066/1333	32 nm	2010
Intel Xeon X5687	4	8	3.60 GHz	3.86 GHz	12 MB	130W	DDR3 800/1066/1333	32 nm	2011
Intel Xeon X5672	4	8	3.20 GHz	3.60 GHz	12 MB	95W	DDR3 800/1066/1333	32 nm	2011
Intel Xeon X5647	4	8	2.93 GHz	3.20 GHz	12 MB	130W	DDR3 800/1066	32 nm	2011
Intel Xeon E5506	4	4	2.13 GHz	-	4 MB	80W	DDR3 800	45 nm	2009
Intel Xeon E5507	4	4	2.26 GHz	-	4 MB	80W	DDR3 800	45 nm	2010
Intel Xeon E5504	4	4	2.00 GHz	-	4 MB	80W	DDR3 800	45 nm	2009
Intel Xeon L5506	4	4	2.13 GHz	-	4 MB	60W	DDR3 800	45 nm	2009
Intel Xeon L5609	4	4	1.86 GHz	1.86 GHz	12 MB	40W	DDR3 800/1066	32 nm	2010
Intel Xeon E5607	4	4	2.26 GHz	-	8 MB	80W	DDR3 800/1066	32 nm	2011
Intel Xeon E5606	4	4	2.13 GHz	-	8 MB	80W	DDR3 800/1066	32 nm	2011
Intel Xeon E5603	4	4	1.60 GHz	-	4 MB	80W	DDR3 800/1066	32 nm	2011
Intel Xeon E5502	2	2	1.86 GHz	-	4 MB	80W	DDR3 800	45 nm	2009
Intel Xeon E5503	2	2	2.00 GHz	-	4 MB	80W	DDR3 800	45 nm	2010

Compatibility with motherboards

There are no compatibility issues. All branded motherboards can work properly with both Desktop and Xeon processors. No need to flash the BIOS, reinstall the OS, or take any other actions.

The exception may be some Chinese motherboards, as well as rare models of workstation motherboards that have problems working with 130W processors.

What type of memory does LGA 1366 support?

LGA 1366 supports triple-channel DDR3 memory.

Best options for replacement or upgrade

We have compiled a list of the best processors for LGA 1366 socket, including their descriptions, overclocking capabilities, and TDP. Our table will help you find the right CPU for your system and budget, whether you’re a gamer, workstation user, or media center enthusiast.

Processor model	Description	Overclocking	TDP	Estimated Price
Xeon X5650	The most affordable six-core processor from the X series for moderate overclocking. Easily reaches 4 GHz and above, which is sufficient for most games.	Yes	95W	$30-$50
Xeon E5645 / E5649	Slightly less powerful but cooler six-core processors can be considered if moderate overclocking is planned, however, lower TDP is desired.	Yes	80W	$30-$50
Xeon X5670	A good option for systems where overclocking is not possible. They have a sufficiently high frequency and are not as expensive as the most powerful X5690.	No	95W	$40-$60
Xeon L5640	The most powerful processor from the L series. Suitable for cold, silent systems, media centers, etc. Overclocking up to 3.6 GHz is possible.	Yes	60W	$40-$60

*The i7 processors for LGA 1366 socket are not included in this table, as they are expensive and difficult to find in the market.

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Denis B.

Author and developer of the website

For many years, I have been following the PC and component market, building computers, and constantly improving my expertise in this field. With my website, I aim to share my knowledge and provide helpful guides and advice for those interested in building and upgrading their own computers.