Intel Xeon L5609 socket: LGA 1366
The Intel Xeon L5609 uses the LGA 1366 socket. It is a 40 W quad core Westmere-EP server part at 1866 MHz with 12 MB of L3 cache for efficient dual socket nodes.
- Socket
- LGA 1366
- Launched
- March 2010
- Cores and threads
- 4 and 4
- Base power
- 40 W
- Codename
- Westmere-EP
- Segment
- Server
- Family
- Intel Xeon L
- Clocks
- 1.87 GHz
Intel Xeon L5609 specifications
| Cores | 4 |
|---|---|
| Threads | 4 |
| Core architecture | Westmere-EP cores on 32 nm |
| Clocks | 1866 MHz (no turbo) |
| Cache | 12 MB L3 (shared) |
| Processor base power (TDP) | 40 W |
| Manufacturing process | 32 nm |
| Memory support | DDR3-800 and 1066 ECC triple channel |
| PCI Express | PCIe Gen 2 from the chipset |
| Integrated graphics | None |
| Multiplier | Locked |
| Package | LGA1366 |
Motherboard and chipset compatibility
Intel Xeon L5609 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 L5609 is
The Intel Xeon L5609 is a quad core Westmere-EP server processor from March 2010. It runs four Westmere cores at 1866 MHz with no turbo and no Hyper-Threading, so 4 cores give 4 threads. Cache is 12 MB of shared L3 on a 32 nm process. Power is rated at 40 W with 4.8 GT/s QPI.
Intel ARK confirms 4 cores, 4 threads, no turbo and no Hyper-Threading at 40 W with ECC triple channel memory. The L prefix marks low voltage for dense efficient nodes. Against the L5618 it trades threads for determinism in latency sensitive virtualization hosts.
Memory is DDR3-800 and 1066 ECC triple channel up to 288 GB per the ARK entry.
Socket and motherboard compatibility
The Xeon L5609 fits LGA 1366 with 1366 lands. Intel 5500 and 5520 chipset boards boot Westmere-EP with BIOS 45 or later. Dual socket operation needs a matched pair.
The socket table covers Westmere-EP natively. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.
Memory, PCIe and cooling
Memory is DDR3-800 and 1066 ECC triple channel per socket.
Two QPI links scale to dual socket nodes, with PCIe Gen 2 from the chipset.
Cooling uses server heatsinks rated for 40 W.
Upgrade paths
On LGA 1366 the server upgrade is the L5618 with threads at the same 40 W, or a 60 W six core with a BIOS update. Beyond LGA 1366 a move to Sandy Bridge E5 needs a new board.
Frequently asked questions
What socket does the Xeon L5609 use?
LGA 1366, the 1366-land package on 5500 and 5520 chipset boards with BIOS 45 or later.
How many cores does the Xeon L5609 have?
Four cores and four threads at 1866 MHz with 12 MB of shared L3 cache. It has no Hyper-Threading and no turbo.
What memory works with the Xeon L5609?
DDR3-800 and 1066 ECC triple channel per socket.
Sources and verification
Facts last checked against these sources on . Page last edited on .