Intel® Xeon™ E5-2666 v4

The Intel Xeon E5-2666 v4 is a server processor with 12 cores and 24 threads, built on the Broadwell architecture. It launched in 2016. Clocks run from 2.8 GHz base to 3.4 GHz boost. A 30-MB L3 cache backs the cores (2.8 MB per core). It supports DDR4 memory. It uses the FCLGA2011-3 socket. Rated TDP is 145 W.

The Intel Xeon E5-2666 v4 scores 2,052 in single-core performance and 17,958 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 6,070 for overall performance, 14,546 for productivity performance, 13,571 for creator performance, 19,529 for engineering performance and 10,646 for gaming performance. Its multi-core throughput works out to 1,497 per core, 748 per thread and 124 per watt. Its computed efficiency index is 504. Its performance index is 75, so its overall performance is 25% below the Intel Core i5-12400 (index 100). Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the Intel Xeon E5-2666 v4 scores 65,613 in integer math, 42,992 in floating-point math, 285,920 in compression, 5,386 in cryptography, 1,230 in physics simulation, 18,045 in vector SIMD, 92 in the prime sieve and 35,229 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 11% above in integer math, 6% below in floating-point math, 25% above in compression, 53% below in cryptography, 13% above in physics simulation, 16% above in vector SIMD, 37% above in the prime sieve and 56% above in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The Intel Xeon E5-2666 v4 has 12 physical cores and runs 24 logical threads. It does not use a hybrid performance and efficiency core layout. It runs 2 threads per core. It runs at a base clock of 2.80 GHz and boosts up to 3.40 GHz.

The Intel Xeon E5-2666 v4 is a server processor, belongs to the Intel Xeon E5 family and uses the Broadwell architecture. It launched in 2016.

The Intel Xeon E5-2666 v4 has 768 KB of L1 cache, 3 MB of L2 cache and 30 MB of L3 cache. That adds up to about 33.8 MB of cache, or 2.81 MB per core. Each core has 256 KB of private L2 cache.

The Intel Xeon E5-2666 v4 has a 3-level cache hierarchy: L1 at 768 KB, L2 at 3 MB and L3 at 30 MB. L3 is the largest level and makes up about 89% of the cache listed here.

The Intel Xeon E5-2666 v4 supports DDR4 memory and runs memory at up to 2,400 MT/s. It does not support DDR5 and LPDDR memory.

The Intel Xeon E5-2666 v4 uses the FCLGA2011-3 socket.

The Intel Xeon E5-2666 v4 has a rated TDP of 145 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

Feex has recorded 49% of the specifications it tracks for the Intel Xeon E5-2666 v4. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Efficiency Cores, All-Core Boost and Unlocked Multiplier. Architecture & Generation: Codename, ISA Family and Market Status. Cache: L4 Cache. Memory Support: Memory Channels, Memory Bandwidth and ECC Memory. Graphics: Integrated Graphics, Graphics Model, Graphics Base Clock, Graphics Max Clock, Execution Units, Display Outputs and Max Video Memory. Platform & Compatibility: Package, Package Size and PCIe Lanes. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size, Die Count, Foundry and Launch Price. Naming & Aliases: SKU, Model Number, Processor Number and Part Number.

Processors that use the same FCLGA2011-3 socket as the Intel Xeon E5-2666 v4 and have the closest multi-core scores in the Feex database include Intel Xeon E5-2686 v3, Intel Xeon E5-2682 v4, Intel Xeon E5-2689 v4, Intel Xeon E5-2676 v4 and Intel Xeon E5-2686 v4.