Intel Xeon L5408 socket: Socket 771
The Intel Xeon L5408 uses the Socket 771 socket. It is a 40 W quad-core Harpertown low-voltage server part at 2.133 GHz with 12 MB of L2 cache for dense racks.
- Socket
- Socket 771
- Launched
- February 2008
- Cores and threads
- 4 and 4
- Base power
- 40 W
- Codename
- Harpertown
- Segment
- Server
- Family
- Intel Xeon
- Clocks
- 2.13 GHz
Intel Xeon L5408 specifications
| Cores | 4 |
|---|---|
| Threads | 4 |
| Core architecture | Harpertown cores on 45 nm |
| Clocks | 2.133 GHz (no turbo) |
| Cache | 12 MB L2 (2x6 MB) |
| Processor base power (TDP) | 40 W |
| Manufacturing process | 45 nm |
| Memory support | DDR2 FB-DIMMs through the server board chipset |
| Front side bus | 1066 MT/s |
| PCI Express | PCIe from the board chipset |
| Integrated graphics | None |
| Multiplier | Locked |
| Package | LGA 771 |
Motherboard and chipset compatibility
Intel Xeon L5408 needs a motherboard with a Socket 771 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| Intel 5400 series | 5400 | 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 Socket 771.
Socket 771 at a glance
| Type | LGA, 771 contacts |
|---|---|
| Package size | 37.5 × 37.5 mm |
| Introduced | May 2006 |
| Memory | DDR2 and DDR3 through the server board chipset |
| Cooler mounting holes | Board specific (server heatsink) |
What the Xeon L5408 is
The Intel Xeon L5408 is a low-voltage 2.133 GHz server quad core from February 2008. It runs four Core cores at 2.133 GHz with no turbo, so 4 cores give 4 threads. Cache is 6 MB of L2 per die, 12 MB total, on a 45 nm process. Power is rated at 40 W on Socket 771.
Harpertown packs two Wolfdale dies with a 1066 MT/s front side bus for dual-processor servers. The L5408 exists because dense blade and rack servers needed quad cores inside a 40 W envelope where standard 80 W parts could not go. Launch timing rests on the task list at February 2008 against a March 2008 datasheet entry.
Socket and motherboard compatibility
The L5408 fits dual-socket Socket 771 server boards with a BIOS that lists low-voltage Harpertown parts. It suits dense chassis qualified for 40 W quads. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.
Memory, PCIe and cooling
Memory is DDR2 FB-DIMMs through the server board chipset.
A 1066 MT/s front side bus ties the CPU to the server chipset. PCIe slots hang off the chipset.
Cooling uses vendor qualified server heatsinks for the 40 W envelope in dense chassis with directed airflow.
Upgrade paths
On Socket 771 the upgrade is the Intel Xeon L5410 at 2.333 GHz or the Intel Xeon L5420 at 2.5 GHz within the 50 W low-voltage line. The Intel Xeon L5430 at 2.667 GHz tops the efficient range. Beyond Socket 771 a move to a newer Xeon platform needs new boards and memory.
Frequently asked questions
What socket does the Xeon L5408 use?
Socket 771, in dual-socket server boards with low-voltage support.
How many cores does the Xeon L5408 have?
Four cores and 4 threads at 2.133 GHz with 6 MB of L2 per die.
What memory works with the Xeon L5408?
DDR2 FB-DIMMs through the server board chipset.
Sources and verification
Facts last checked against these sources on . Page last edited on .