Socket 1366 / Socket B / Socket LGA1366

Socket 1366, also called LGA1366 or Socket B, is a Land Grid Array (LGA) socket used by the latest generation of server-class Intel Core i7 and Xeon microprocessors. The socket supports triple-channel or six-channel DDR3 SDRAM memory controller and up to two QuickPath Interconnect links with frequencies up to 3.2 GHz. The socket 1366 along with the socket 1156 superseded socket 775.

The socket has 1366 contacts arranged as a grid of 43 x 41 contacts with 21 x 17 section de-populated in the center, and with 40 contacts in the socket corners and socket edges removed. After the processor is placed into the socket it has to be secured by pushing down socket's load lever.

The socket LGA1366 has 70% more contact pads than socket LGA775. Large increase in the number of contact pads was achieved by increasing socket size by 35% - 40%, and by reducing the distance between contact pads by 15%.

Supported processors

CPU Family	Frequency	The fastest CPU(s)
Core i7	2.67 GHz - 3.2 GHz	Core i7-960 (4 cores) Core i7-970 (6 cores)
Core i7 Extreme Edition	3.2 GHz - 3.47 GHz	Core i7-990X
Xeon 3500 series	2.67 GHz - 3.33 GHz	Xeon W3580
Xeon 3600 series	3.2 GHz - 3.47 GHz	Xeon W3690
Xeon 5500 series	1.86 GHz - 3.33 GHz	Xeon W5590
Xeon 5600 series	1.86 GHz - 4.4 GHz	Xeon X5690 (6 cores, 3.47 GHz) Xeon X5687 (4 cores, 3.6 GHz) Xeon X5698 (2 cores, 4.4 GHz)

There are no CPUs from other manufacturers compatible with socket 1366.

Compatible package types

1366-land Flip Chip Land Grid Array package.

Upgrading socket 1366 motherboards

To determine the fastest supported processor for socket 1366 motherboard you'll need to:

• Determine manufacturer and model of the motherboard,
• Search on manufacturer's website for the motherboard model.

For upgrade information for ABIT, ASrock, ASUS, Biostar, DFI, ECS, Gigabyte Technology, Intel, Jetway, MSI, PC Chips, Shuttle and Tyan motherboards please check CPU-Upgrade motherboard database.