Ryzen 7 5800X vs Pentium III 866
Primary details
Comparing Pentium III 866 and Ryzen 7 5800X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 355 |
| Place by popularity | not in top-100 | 60 |
| Cost-effectiveness evaluation | no data | 23.44 |
| Market segment | Desktop processor | Desktop processor |
| Series | no data | AMD Ryzen 7 |
| Power efficiency | no data | 15.80 |
| Architecture codename | Coppermine T (2000) | Vermeer (Zen 3) (2020−2022) |
| Release date | 20 March 2000 (24 years ago) | 8 October 2020 (4 years ago) |
| Launch price (MSRP) | no data | $449 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Pentium III 866 and Ryzen 7 5800X 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 | 1 (Single-Core) | 8 (Octa-Core) |
| Threads | 1 | 16 |
| Base clock speed | no data | 3.8 GHz |
| Boost clock speed | 0.87 GHz | 4.7 GHz |
| Multiplier | no data | 38 |
| L1 cache | 32 KB | 512 KB |
| L2 cache | 256 KB | 4 MB |
| L3 cache | 0 KB | 32 MB |
| Chip lithography | 180 nm | 7 nm, 12 nm |
| Die size | 106 mm2 | 2 x 80.7 sq. mm; I/O = 125 mm2 |
| Maximum core temperature | no data | 90 °C |
| Maximum case temperature (TCase) | 80 °C | 95 °C |
| Number of transistors | 28 million | no data |
| 64 bit support | - | + |
| Windows 11 compatibility | - | + |
| Unlocked multiplier | - | + |
Compatibility
Information on Pentium III 866 and Ryzen 7 5800X 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 | 370 | AM4 |
| Power consumption (TDP) | 27 Watt | 105 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium III 866 and Ryzen 7 5800X. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | MMX (+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A, AES, AVX, AVX2, FMA3, SHA |
| AES-NI | - | + |
| AVX | - | + |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Pentium III 866 and Ryzen 7 5800X are enumerated here.
| AMD-V | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium III 866 and Ryzen 7 5800X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR4 |
| Maximum memory size | no data | 128 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 51.196 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | - |
Peripherals
Specifications and connection of peripherals supported by Pentium III 866 and Ryzen 7 5800X.
| PCIe version | no data | 4.0 |
Pros & cons summary
| Recency | 20 March 2000 | 8 October 2020 |
| Physical cores | 1 | 8 |
| Threads | 1 | 16 |
| Chip lithography | 180 nm | 7 nm |
| Power consumption (TDP) | 27 Watt | 105 Watt |
Pentium III 866 has 288.9% lower power consumption.
Ryzen 7 5800X, on the other hand, has an age advantage of 20 years, 700% more physical cores and 1500% more threads, and a 2471.4% more advanced lithography process.
We couldn't decide between Pentium III 866 and Ryzen 7 5800X. We've got no test results to judge.
Should you still have questions on choice between Pentium III 866 and Ryzen 7 5800X, ask them in Comments section, and we shall answer.
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