Intel Xeon E5405 socket: Socket 771
The Intel Xeon E5405 uses the Socket 771 socket. It is an 80 W quad-core Harpertown server part at 2 GHz with 12 MB of L2 cache for entry dual-processor racks.
- Socket
- Socket 771
- Launched
- November 2007
- Cores and threads
- 4 and 4
- Base power
- 80 W
- Codename
- Harpertown
- Segment
- Server
- Family
- Intel Xeon
- Clocks
- 2.0 GHz
Intel Xeon E5405 specifications
| Cores | 4 |
|---|---|
| Threads | 4 |
| Core architecture | Harpertown cores on 45 nm |
| Clocks | 2 GHz (no turbo) |
| Cache | 12 MB L2 (2x6 MB) |
| Processor base power (TDP) | 80 W |
| Manufacturing process | 45 nm |
| Memory support | DDR2 FB-DIMMs through the server board chipset |
| Front side bus | 1333 MT/s |
| PCI Express | PCIe from the board chipset |
| Integrated graphics | None |
| Multiplier | Locked |
| Package | LGA 771 |
Motherboard and chipset compatibility
Intel Xeon E5405 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 E5405 is
The Intel Xeon E5405 is a 2 GHz entry server quad core from November 2007. It runs four Core cores at 2 GHz with no turbo, so 4 cores give 4 threads. Cache is 12 MB of L2 as two 6 MB dies on a 45 nm process. Power is rated at 80 W on Socket 771.
The E5405 opened the Harpertown 5400 line on a 1333 MT/s bus with a 6x multiplier at about 209 dollars launch price. It exists because entry servers wanted quad core throughput with the full 12 MB cache at the lowest Harpertown clock.
Socket and motherboard compatibility
The E5405 fits dual-socket Socket 771 server boards with a BIOS that lists Harpertown quads. It suits entry racks qualified for 80 W quads. Check the server maker CPU list for the exact board and stepping. 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 1333 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 80 W envelope in racks with directed airflow.
Upgrade paths
On Socket 771 the upgrade is the Intel Xeon E5410 at 2.333 GHz with the same cache at 80 W, or the Intel Xeon E5450 at 3 GHz for top clocks. Beyond Socket 771 a move to a newer Xeon platform needs new boards and memory.
Frequently asked questions
What socket does the Xeon E5405 use?
Socket 771, in dual-socket server boards with Harpertown support.
How many cores does the Xeon E5405 have?
Four cores and 4 threads at 2 GHz with 12 MB of L2 cache.
What memory works with the Xeon E5405?
DDR2 FB-DIMMs through the server board chipset.
Sources and verification
Facts last checked against these sources on . Page last edited on .