Xeon E3-1286 v3 vs E5-2666 V3
Aggregate performance score
Xeon E5-2666 V3 outperforms Xeon E3-1286 v3 by an impressive 91% based on our aggregate benchmark results.
Primary details
Comparing Xeon E5-2666 V3 and Xeon E3-1286 v3 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 866 | 1287 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Server | Server |
| Power efficiency | 6.26 | 5.26 |
| Architecture codename | Haswell-EP (2014−2015) | no data |
| Release date | 13 November 2014 (10 years ago) | 1 April 2014 (10 years ago) |
Detailed specifications
Xeon E5-2666 V3 and Xeon E3-1286 v3 basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 10 (Deca-Core) | 4 (Quad-Core) |
| Threads | 20 | 8 |
| Base clock speed | 2.9 GHz | 3.7 GHz |
| Boost clock speed | 3.5 GHz | 4.1 GHz |
| Bus rate | no data | 5 GT/s |
| L1 cache | 64K (per core) | no data |
| L2 cache | 256K (per core) | no data |
| L3 cache | 25 MB (shared) | 8 MB Intel® Smart Cache |
| Chip lithography | 22 nm | 22 nm |
| Die size | 356 mm2 | no data |
| Number of transistors | 2,600 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | no data | - |
Compatibility
Information on Xeon E5-2666 V3 and Xeon E3-1286 v3 compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 2 | 1 |
| Socket | 2011-3 | FCLGA1150 |
| Power consumption (TDP) | 135 Watt | 84 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon E5-2666 V3 and Xeon E3-1286 v3. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | + | + |
| AVX | + | - |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | no data | 2.0 |
| Hyper-Threading Technology | no data | + |
| TSX | + | + |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| SIPP | - | + |
| FDI | no data | + |
| Fast Memory Access | no data | + |
Security technologies
Xeon E5-2666 V3 and Xeon E3-1286 v3 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | no data | + |
| Secure Key | no data | + |
| Identity Protection | - | + |
| OS Guard | no data | + |
| Anti-Theft | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon E5-2666 V3 and Xeon E3-1286 v3 are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon E5-2666 V3 and Xeon E3-1286 v3. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3, DDR4 2133 MHz Quad-channel | DDR3L-1333, DDR3L-1600 |
| Maximum memory size | no data | 32 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 25.6 GB/s |
| ECC memory support | - | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Max video memory | no data | 1.7 GB |
| Quick Sync Video | - | + |
| Clear Video HD | no data | + |
| Graphics max frequency | no data | 1.3 GHz |
| Execution Units | no data | 20 |
| InTru 3D | no data | + |
Graphics interfaces
Available interfaces and connections of Xeon E5-2666 V3 and Xeon E3-1286 v3 integrated GPUs.
| Number of displays supported | no data | 3 |
| eDP | no data | + |
| DisplayPort | - | + |
| HDMI | - | + |
| VGA | no data | + |
Graphics image quality
Maximum display resolutions supported by Xeon E5-2666 V3 and Xeon E3-1286 v3 integrated GPUs, including resolutions over different interfaces.
| Max resolution over HDMI 1.4 | no data | 3840x2160@60Hz |
| Max resolution over DisplayPort | no data | 3840x2160@60Hz |
| Max resolution over VGA | no data | 2880x1800@60Hz |
Graphics API support
APIs supported by Xeon E5-2666 V3 and Xeon E3-1286 v3 integrated GPUs, sometimes API versions are included.
| DirectX | no data | 11.2 |
| OpenGL | no data | 4.3 |
Peripherals
Specifications and connection of peripherals supported by Xeon E5-2666 V3 and Xeon E3-1286 v3.
| PCIe version | 3.0 | 3.0 |
| PCI Express lanes | 40 | 16 |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.
Pros & cons summary
| Performance score | 8.93 | 4.67 |
| Recency | 13 November 2014 | 1 April 2014 |
| Physical cores | 10 | 4 |
| Threads | 20 | 8 |
| Power consumption (TDP) | 135 Watt | 84 Watt |
Xeon E5-2666 V3 has a 91.2% higher aggregate performance score, an age advantage of 7 months, and 150% more physical cores and 150% more threads.
Xeon E3-1286 v3, on the other hand, has 60.7% lower power consumption.
The Xeon E5-2666 V3 is our recommended choice as it beats the Xeon E3-1286 v3 in performance tests.
Should you still have questions on choice between Xeon E5-2666 V3 and Xeon E3-1286 v3, ask them in Comments section, and we shall answer.
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