Xeon E5-2666 V3 vs i9-9900KF
Aggregate performance score
Core i9-9900KF outperforms Xeon E5-2666 V3 by a significant 28% based on our aggregate benchmark results.
Primary details
Comparing Core i9-9900KF and Xeon E5-2666 V3 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 674 | 854 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 8.18 | no data |
| Market segment | Desktop processor | Server |
| Series | Intel Core i9 | no data |
| Power efficiency | 11.45 | 6.28 |
| Architecture codename | Coffee Lake-R (2018−2019) | Haswell-EP (2014−2015) |
| Release date | 7 January 2019 (5 years ago) | 13 November 2014 (10 years ago) |
| Launch price (MSRP) | $488 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Core i9-9900KF 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 | 8 (Octa-Core) | 10 (Deca-Core) |
| Threads | 16 | 20 |
| Base clock speed | 3.6 GHz | 2.9 GHz |
| Boost clock speed | 5 GHz | 3.5 GHz |
| Bus type | DMI 3.0 | no data |
| Bus rate | 4 × 8 GT/s | no data |
| L1 cache | 512 KB | 64K (per core) |
| L2 cache | 2 MB | 256K (per core) |
| L3 cache | 16 MB (shared) | 25 MB (shared) |
| Chip lithography | 14 nm | 22 nm |
| Die size | no data | 356 mm2 |
| Maximum core temperature | 100 °C | no data |
| Maximum case temperature (TCase) | 72 °C | no data |
| Number of transistors | no data | 2,600 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | + | - |
Compatibility
Information on Core i9-9900KF 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 | 1 (Uniprocessor) | 2 |
| Socket | FCLGA1151 | 2011-3 |
| Power consumption (TDP) | 95 Watt | 135 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i9-9900KF and Xeon E5-2666 V3. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 | no data |
| AES-NI | + | + |
| AVX | + | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | 2.0 | no data |
| Hyper-Threading Technology | + | no data |
| TSX | + | + |
| Idle States | + | no data |
| Thermal Monitoring | + | - |
Security technologies
Core i9-9900KF and Xeon E5-2666 V3 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | + |
| EDB | + | no data |
| Secure Key | + | no data |
| MPX | + | - |
| Identity Protection | + | - |
| SGX | Yes with Intel® ME | no data |
| OS Guard | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i9-9900KF 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 Core i9-9900KF and Xeon E5-2666 V3. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-2666 | DDR3, DDR4 2133 MHz Quad-channel |
| Maximum memory size | 128 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 42.671 GB/s | no data |
Peripherals
Specifications and connection of peripherals supported by Core i9-9900KF and Xeon E5-2666 V3.
| PCIe version | 3.0 | 3.0 |
| PCI Express lanes | 16 | 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 | 11.54 | 9.00 |
| Recency | 7 January 2019 | 13 November 2014 |
| Physical cores | 8 | 10 |
| Threads | 16 | 20 |
| Chip lithography | 14 nm | 22 nm |
| Power consumption (TDP) | 95 Watt | 135 Watt |
i9-9900KF has a 28.2% higher aggregate performance score, an age advantage of 4 years, a 57.1% more advanced lithography process, and 42.1% lower power consumption.
Xeon E5-2666 V3, on the other hand, has 25% more physical cores and 25% more threads.
The Core i9-9900KF is our recommended choice as it beats the Xeon E5-2666 V3 in performance tests.
Note that Core i9-9900KF is a desktop processor while Xeon E5-2666 V3 is a server/workstation one.
Should you still have questions on choice between Core i9-9900KF and Xeon E5-2666 V3, ask them in Comments section, and we shall answer.
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