Intel Xeon E5-2666 v3 socket: LGA 2011-v3

What the Xeon E5-2666 v3 is

The Xeon E5-2666 v3 is an OEM Haswell-EP ten core with high clocks for vendor clouds on LGA 2011-v3. Intel set ten cores and 20 threads at 2.9 GHz base with turbo to 3.5 GHz. Twenty five megabytes of Smart Cache serve dense guests. Power is 135 W on 22 nm from November 2014. OEM status ties it to vendor systems with locked firmware matrices.

High base clocks near 3 GHz keep both single and multi thread work direct. Twenty threads consolidate guests per socket for large deployments. Large cache covers many tenants. ECC DDR4 protects data across long runs. No integrated graphics exist. Fabric and storage shape node throughput alongside cores. Used buyers find this SKU in vendor pulls where generic board support varies.

DDR4 ECC over four channels feeds each socket with two QPI links between dual nodes. The mix is a server socket for clouds that buy vendor nodes where fast ten cores at 135 W are wanted.

Socket and motherboard compatibility

The E5-2666 v3 fits LGA 2011-v3 on vendor C612 Grantley platforms. OEM stepping validation may block generic boards, so confirm the system matrix before purchase. Desktop X99 never takes this server OEM chip.

ECC RDIMMs over four channels carry memory. The Socket vs chipset: what decides whether a CPU works guide is desktop focused, so follow vendor population rules. Cooling uses vendor 135 W heatsinks with strong rack airflow.

Retail ten core E5 v3 offer wider board support where OEM locks bind. Verify microcode before cross vendor use.

Memory, PCIe and cooling

DDR4 ECC quad channel per socket suits dense virtualization. Even DIMM maps protect NUMA balance. Large RDIMMs reach high guest counts. Speed steps with population per manual.

Forty PCIe 3.0 lanes per socket feed NICs, HBAs and NVMe for cloud fabric. NUMA placement across QPI links matters at ten cores. Vendor manuals detail controller slot maps.

Vendor 135 W cooling sustains all core loads with cool inlets. No retail cooler exists. Turbo residency follows per core states and inlet air.

Upgrade paths

On the same socket the Intel Xeon E5-2640 v3 with eight cores suits retail boards for mixed loads. The Intel Core i7-5960X is an eight core HEDT chip without ECC for single socket creation. Both need chipset checks.

Newer server sockets replace Grantley. The E5-2666 v3 covers OEM clouds where fast ten cores at 135 W are the pick.