Xeon E5-2666 V3 vs Gold 6256
Aggregate performance score
Xeon Gold 6256 outperforms Xeon E5-2666 V3 by a whopping 230% based on our aggregate benchmark results.
Primary details
Comparing Xeon Gold 6256 and Xeon E5-2666 V3 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 146 | 866 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Server | Server |
| Power efficiency | 13.58 | 6.25 |
| Architecture codename | no data | Haswell-EP (2014−2015) |
| Release date | 1 January 2020 (4 years ago) | 13 November 2014 (10 years ago) |
Detailed specifications
Xeon Gold 6256 and Xeon E5-2666 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 | 12 (Dodeca-Core) | 10 (Deca-Core) |
| Threads | 24 | 20 |
| Base clock speed | 3.6 GHz | 2.9 GHz |
| Boost clock speed | 4.5 GHz | 3.5 GHz |
| L1 cache | no data | 64K (per core) |
| L2 cache | no data | 256K (per core) |
| L3 cache | 33 MB | 25 MB (shared) |
| Chip lithography | 14 nm | 22 nm |
| Die size | no data | 356 mm2 |
| Maximum core temperature | 64 °C | no data |
| Number of transistors | no data | 2,600 million |
| 64 bit support | - | + |
| Windows 11 compatibility | + | no data |
Compatibility
Information on Xeon Gold 6256 and Xeon E5-2666 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 | no data | 2 |
| Socket | FCLGA3647 | 2011-3 |
| Power consumption (TDP) | 205 Watt | 135 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon Gold 6256 and Xeon E5-2666 V3. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512 | no data |
| AES-NI | + | + |
| AVX | - | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| Speed Shift | + | no data |
| Turbo Boost Technology | 2.0 | no data |
| Hyper-Threading Technology | + | no data |
| TSX | + | + |
| Turbo Boost Max 3.0 | - | no data |
| Deep Learning Boost | + | - |
Security technologies
Xeon Gold 6256 and Xeon E5-2666 V3 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon Gold 6256 and Xeon E5-2666 V3 are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon Gold 6256 and Xeon E5-2666 V3. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-2933 | DDR3, DDR4 2133 MHz Quad-channel |
| Maximum memory size | 1 TB | no data |
| Max memory channels | 6 | no data |
| ECC memory support | + | - |
Peripherals
Specifications and connection of peripherals supported by Xeon Gold 6256 and Xeon E5-2666 V3.
| PCIe version | 3.0 | 3.0 |
| PCI Express lanes | 48 | 40 |
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 | 29.44 | 8.92 |
| Recency | 1 January 2020 | 13 November 2014 |
| Physical cores | 12 | 10 |
| Threads | 24 | 20 |
| Chip lithography | 14 nm | 22 nm |
| Power consumption (TDP) | 205 Watt | 135 Watt |
Xeon Gold 6256 has a 230% higher aggregate performance score, an age advantage of 5 years, 20% more physical cores and 20% more threads, and a 57.1% more advanced lithography process.
Xeon E5-2666 V3, on the other hand, has 51.9% lower power consumption.
The Xeon Gold 6256 is our recommended choice as it beats the Xeon E5-2666 V3 in performance tests.
Should you still have questions on choice between Xeon Gold 6256 and Xeon E5-2666 V3, ask them in Comments section, and we shall answer.
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