Intel Xeon E5-2686 v3 socket: LGA 2011-v3

What the Xeon E5-2686 v3 is

The Xeon E5-2686 v3 is an OEM Haswell-EP flagship with eighteen cores for dense clouds on LGA 2011-v3. Intel set eighteen cores and 36 threads at 2.0 GHz base with turbo to 3.5 GHz. Forty five megabytes of Smart Cache cover very large guest counts. Power is 120 W on 22 nm from September 2014. OEM distribution means vendor system validation rather than retail channel support.

Eighteen cores pack the most threads of the v3 line per socket for consolidation ratios. Low base clocks hold power while wide turbo lifts single thread bursts to 3.5 GHz. Huge cache trims memory trips across dozens of guests. ECC DDR4 protects data through long runs. No integrated graphics exist. Network and storage fabric decide node throughput alongside cores. Used buyers meet this SKU in vendor pulls with locked firmware.

DDR4 ECC over four channels feeds each socket with two QPI links between dual nodes. The mix is a server socket for large clouds where threads per socket dominate buying.

Socket and motherboard compatibility

The E5-2686 v3 fits LGA 2011-v3 on vendor C612 Grantley systems. OEM validation ties it to specific vendor platforms, so generic boards may reject its stepping. Verify the system matrix before sourcing used parts. Desktop X99 never supports this OEM server chip.

Memory is ECC RDIMMs over four channels. The Socket vs chipset: what decides whether a CPU works guide is desktop focused, so follow vendor population rules. Cooling uses vendor 120 W heatsinks with strong rack airflow.

Retail high core E5 v3 offer wider board support where OEM locks block use. Confirm microcode before any cross vendor move.

Memory, PCIe and cooling

DDR4 ECC in quad channel per socket suits massive guests. Even DIMM maps protect NUMA fairness. Large RDIMMs reach high counts. Speed follows population per manual.

Forty PCIe 3.0 lanes per socket serve fabric HBAs and NVMe for cloud storage. NUMA aware placement across QPI links matters at this core count. Vendor slot maps guide controller choices.

Vendor 120 W cooling sustains all core loads with cool inlets. No retail part exists. Turbo to 3.5 GHz needs thermal headroom and per core power states.

Upgrade paths

On the same socket the Intel Xeon E5-2698 v3 with sixteen cores offers retail availability for broader boards. The Intel Core i7-5960X is an eight core HEDT chip without ECC for single socket work. Both need chipset checks.

Newer server sockets replace this platform. The E5-2686 v3 covers OEM clouds where eighteen cores at 120 W are the density pick.