i486SX-20 vs Pentium III 866
Primary details
Comparing Pentium III 866 and i486SX-20 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel 80486 |
| Architecture codename | Coppermine T (2000) | 80486 (1989) |
| Release date | 20 March 2000 (24 years ago) | no data |
Detailed specifications
Pentium III 866 and i486SX-20 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) | 1 (Single-Core) |
| Threads | 1 | no data |
| Boost clock speed | 0.87 GHz | 0.02 GHz |
| Bus type | no data | FSB |
| Bus rate | no data | 20 MT/s |
| Multiplier | no data | 1 |
| L1 cache | 32 KB | 8 KB |
| L2 cache | 256 KB | no data |
| L3 cache | 0 KB | no data |
| Chip lithography | 180 nm | 1 µm, 800 nm |
| Die size | 106 mm2 | no data |
| Maximum case temperature (TCase) | 80 °C | no data |
| Number of transistors | 28 million | 1 Million |
| 64 bit support | - | - |
| Windows 11 compatibility | - | no data |
Compatibility
Information on Pentium III 866 and i486SX-20 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 | no data |
| Socket | 370 | no data |
| Power consumption (TDP) | 27 Watt | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium III 866 and i486SX-20. Depending on the motherboard, higher memory frequencies may be supported.
| Maximum memory size | no data | 4 GB |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | no data |
Pros & cons summary
| Chip lithography | 180 nm | 1 nm |
i486SX-20 has a 17900% more advanced lithography process.
We couldn't decide between Pentium III 866 and i486SX-20. We've got no test results to judge.
Note that Pentium III 866 is a desktop processor while i486SX-20 is a notebook one.
Should you still have questions on choice between Pentium III 866 and i486SX-20, ask them in Comments section, and we shall answer.
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