Intel Xeon L5645 socket: LGA 1366
The Intel Xeon L5645 uses the LGA 1366 socket. It is a 60 W six core Westmere-EP server part at 2.4 GHz with turbo to 2.93 GHz and ECC memory.
- Socket
- LGA 1366
- Launched
- February 2011
- Cores and threads
- 6 and 12
- Base power
- 60 W
- Codename
- Westmere-EP
- Segment
- Server
- Family
- Intel Xeon L
- Clocks
- 2.4 / 2.93 GHz
Intel Xeon L5645 specifications
| Cores | 6 |
|---|---|
| Threads | 12 |
| Core architecture | Westmere-EP cores on 32 nm |
| Clocks | 2.4 GHz base, 2.93 GHz turbo |
| Cache | 12 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 60 W |
| Manufacturing process | 32 nm |
| Memory support | DDR3-1333, three channels, ECC supported |
| QPI links | QuickPath Interconnect links |
| PCI Express | PCIe 2.0 |
| Integrated graphics | None (server part) |
| Multiplier | Locked |
| ECC memory | Supported |
| Package | FCLGA1366 |
Motherboard and chipset compatibility
Intel Xeon L5645 needs a motherboard with a LGA 1366 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 5500 and 5520 server | 5500, 5520 | Works out of the box |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for LGA 1366.
LGA 1366 at a glance
| Type | LGA, 1,366 contacts |
|---|---|
| Package size | n/a |
| Introduced | 2008 |
| Memory | DDR3 triple channel, up to 24 GB on desktop boards |
| Cooler mounting holes | 80 × 80 mm |
What the Xeon L5645 is
Intel Xeon L5645 is a six core Westmere-EP server processor that Intel released in February 2011 for single and dual socket boards. It runs at 2.4 GHz base with turbo to 2.93 GHz and includes Hyper-Threading, so 6 cores give 12 threads. Cache is 12 MB Intel Smart Cache. Power is 60 W on a 32 nm process.
The L5645 tops the 60 W L-series on clocks while keeping the low power envelope. Dense racks use it for quiet virtualization nodes. Turbo bins reach 2.93 GHz on lightly threaded work.
There is no integrated graphics on this die. Memory runs in three DDR3 channels with ECC. The chip shipped as an OEM part for system builders.
Socket and motherboard compatibility
The Xeon L5645 fits LGA 1366 in FCLGA1366 form. Single and dual socket server boards with 5500 and 5520 chipsets carry it. The board BIOS must list the exact L5645 string.
QuickPath links join two sockets on dual boards. A board that lists Xeon 56xx strings is the safe choice for low power builds.
Memory, PCIe and cooling
Memory support is DDR3-1333, three channels, with ECC for mission critical work. Three matched modules per socket give the rated bandwidth. Capacity follows the board design.
PCI Express is revision 2.0 for server graphics and storage cards. Lane splits follow the board manual.
Cooling uses 60 W server heatsinks on the 80 by 80 mm pattern. Low power keeps chassis noise down.
Upgrade paths
On LGA 1366 the L5645 already tops the 60 W L-series, so later steps are 95 W X5600 parts with faster fans on the same board. Memory and storage carry over where the board lists both strings. A same socket low power reference is Intel Xeon L5639.
A platform move to LGA 2011 servers needs new boards and memory in fours. Keep the L5645 board for quiet lab duty.
Frequently asked questions
What socket does the Intel Xeon L5645 use?
It uses LGA 1366 on single and dual socket server boards.
How is the Xeon L5645 different from the L5639?
The L5645 runs at 2.4 GHz base with 2.93 GHz turbo. The L5639 runs at 2.13 GHz base with 2.67 GHz turbo.
What memory does the Xeon L5645 use?
DDR3-1333 in three channels with ECC.
Does the Xeon L5645 have Hyper-Threading?
Yes. Six cores give 12 threads.
Sources and verification
- Westmere-EP L5645 2.4 GHz 60W Feb 2011 OEM (Simple Xeon list, turbo bins)
- Westmere (Wikipedia, L5645 2.4 GHz 60W line)
Facts last checked against these sources on . Page last edited on .