Intel Xeon E5-1691 v3 socket: LGA 2011-v3
The Intel Xeon E5-1691 v3 uses the LGA 2011-v3 socket. It is a fourteen core Haswell-EP workstation part with 28 threads from 2.5 GHz to 3.4 GHz at 135 W with 35 MB of cache.
- Socket
- LGA 2011-v3
- Launched
- September 2014
- Cores and threads
- 14 and 28
- Base power
- 135 W
- Codename
- Haswell-EP
- Segment
- Server
- Family
- Intel Xeon E5
- Clocks
- 2.5 / 3.4 GHz
Intel Xeon E5-1691 v3 specifications
| Cores | 14 |
|---|---|
| Threads | 28 |
| Core architecture | Haswell-EP cores on 22 nm |
| Clocks | 2.5 GHz base, up to 3.4 GHz turbo |
| Cache | 35 MB Smart Cache |
| Processor base power (TDP) | 135 W |
| Manufacturing process | 22 nm |
| Memory support | DDR4, four channels, ECC |
| PCI Express | PCIe 3.0, 40 lanes |
| Integrated graphics | None (workstation graphics required) |
| Multiplier | Locked |
| Package | FCLGA2011-3 |
Motherboard and chipset compatibility
Intel Xeon E5-1691 v3 needs a motherboard with a LGA 2011-v3 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| C612 series | C612 | 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 2011-v3.
LGA 2011-v3 at a glance
| Type | LGA, 2,011 contacts |
|---|---|
| Package size | 52.5 × 45 mm |
| Introduced | August 2014 |
| Memory | DDR4-2400, four channels, up to 128 GB |
| Cooler mounting holes | 80 × 80 mm |
What the Xeon E5-1691 v3 is
The Xeon E5-1691 v3 is an OEM Haswell-EP fourteen core for single socket workstations on LGA 2011-v3. Intel set fourteen cores and 28 threads at 2.5 GHz base with turbo to 3.4 GHz. Thirty five megabytes of Smart Cache serve huge assemblies. Power is 135 W on 22 nm from September 2014. OEM status ties firmware support to vendor workstation systems.
Fourteen cores cut parallel render times with threads to spare. Base clocks hold all core throughput while wide turbo to 3.4 GHz lifts interactive steps. Huge cache trims memory trips. ECC DDR4 guards long jobs. Professional graphics cover display, since no integrated GPU ships. NVMe arrays shape load times. Buyers meet this SKU in vendor workstation pulls.
DDR4 ECC over four channels feeds the socket. The mix is a workstation socket for vendor desks where fourteen OEM threads with protection are specified.
Socket and motherboard compatibility
The E5-1691 v3 fits LGA 2011-v3 on vendor C612 workstation platforms. OEM stepping may fail on generic boards. Confirm the system matrix before purchase. X99 desktop never suits this OEM workstation chip.
Memory is ECC UDIMMs or RDIMMs over four channels per vendor support. The Socket vs chipset: what decides whether a CPU works guide is desktop focused, so use vendor manuals. Cooling needs a 135 W tower with strong airflow.
Retail workstation parts offer wider support where OEM locks bind. Verify microcode first.
Memory, PCIe and cooling
DDR4 ECC quad channel suits massive projects. Sixty four gigabytes and above cover simulations with fast storage. Matched sticks give bandwidth. Speed steps per manual.
Forty PCIe lanes feed graphics plus NVMe for project files. Layouts favor x16 professional graphics with storage beside. Chipset lanes add USB and SATA. Manuals show sharing.
Tower 135 W cooling sustains 2.5 GHz with bursts to 3.4 GHz. Mount pressure matters on the large package. Keep memory airflow in mind during long renders.
Upgrade paths
Within the socket the Intel Xeon E5-1686 v3 with twelve OEM cores suits smaller vendor desks. The Intel Xeon E5-1680 v3 with eight retail cores offers broader board support. Both need platform checks.
Newer workstation sockets replace Grantley. The E5-1691 v3 covers vendor desks where fourteen OEM cores are specified.
Frequently asked questions
What socket does the Xeon E5-1691 v3 use?
It uses LGA 2011-v3 on vendor C612 workstation systems.
How many cores does the Xeon E5-1691 v3 have?
Fourteen cores and 28 threads at 2.5 GHz base with turbo to 3.4 GHz.
How much cache does the Xeon E5-1691 v3 have?
35 MB of Smart Cache.
What is the TDP of the Xeon E5-1691 v3?
135 W as an OEM vendor part.
Sources and verification
- List of Intel Xeon processors Haswell-based (Wikipedia, E5-1691 v3 data)
- Haswell microarchitecture (Wikipedia, Haswell-EP data)
Facts last checked against these sources on . Page last edited on .