Xeon 6766E vs i9-9940X
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 467 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 4.15 | no data |
| Market segment | Desktop processor | Server |
| Series | Intel Core i9 | no data |
| Power efficiency | 4.10 | no data |
| Designer | Intel | Intel |
| Manufacturer | Intel | Intel |
| Architecture codename | Skylake (server) (2017−2018) | Sierra Forest (2024) |
| Release date | 8 October 2018 (7 years ago) | 3 June 2024 (1 year ago) |
| Launch price (MSRP) | $1,387 | $10,257 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
Core i9-9940X and Xeon 6766E 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 | 14 (Tetradeca-Core) | 144 |
| Threads | 28 | 144 |
| Base clock speed | 3.3 GHz | 1.9 GHz |
| Boost clock speed | 4.5 GHz | 2.7 GHz |
| Bus type | DMI 3.0 | no data |
| Bus rate | 4 × 8 GT/s | no data |
| Multiplier | 33 | no data |
| L1 cache | 896 KB | 96 KB (per core) |
| L2 cache | 14 MB | 4 MB (per module) |
| L3 cache | 19.25 MB (shared) | 108 MB (shared) |
| Chip lithography | 14 nm | Intel 3 nm |
| Die size | 484 mm2 | no data |
| Maximum core temperature | 88 °C | no data |
| Maximum case temperature (TCase) | no data | 84 °C |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | + | - |
Compatibility
Information on Core i9-9940X and Xeon 6766E 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 | FCLGA2066 | FCLGA4710 |
| Power consumption (TDP) | 165 Watt | 250 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i9-9940X and Xeon 6766E. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512 | Intel® AVX2 |
| AES-NI | + | + |
| AVX | + | + |
| Enhanced SpeedStep (EIST) | + | + |
| 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
Core i9-9940X and Xeon 6766E technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
| EDB | + | + |
| SGX | no data | + |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i9-9940X and Xeon 6766E are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i9-9940X and Xeon 6766E. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-2666 | DDR5-6400 |
| Maximum memory size | 128 GB | 4 TB |
| Max memory channels | 4 | 8 |
| Maximum memory bandwidth | 85.33 GB/s | no data |
| ECC memory support | - | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | N/A |
Peripherals
Specifications and connection of peripherals supported by Core i9-9940X and Xeon 6766E.
| PCIe version | 3.0 | 5.0 |
| PCI Express lanes | 44 | 88 |
Pros & cons summary
| Recency | 8 October 2018 | 3 June 2024 |
| Physical cores | 14 | 144 |
| Threads | 28 | 144 |
| Power consumption (TDP) | 165 Watt | 250 Watt |
i9-9940X has 51.5% lower power consumption.
Xeon 6766E, on the other hand, has an age advantage of 5 years, and 928.6% more physical cores and 414.3% more threads.
We couldn't decide between Intel Core i9-9940X and Intel Xeon 6766E. We've got no test results to judge.
Note that Core i9-9940X is a desktop processor while Xeon 6766E is a server/workstation one.
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