Pentium III 866 vs Phenom X3 8400
Primary details
Comparing Phenom X3 8400 and Pentium III 866 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2686 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 0.73 | no data |
| Architecture codename | Toliman (2008) | Coppermine T (2000) |
| Release date | March 2008 (16 years ago) | 20 March 2000 (24 years ago) |
Detailed specifications
Phenom X3 8400 and Pentium III 866 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 | 3 (Tri-Core) | 1 (Single-Core) |
| Threads | 3 | 1 |
| Boost clock speed | 2.1 GHz | 0.87 GHz |
| L1 cache | 128 KB (per core) | 32 KB |
| L2 cache | 512 KB (per core) | 256 KB |
| L3 cache | 2 MB (shared) | 0 KB |
| Chip lithography | 65 nm | 180 nm |
| Die size | 285 mm2 | 106 mm2 |
| Maximum case temperature (TCase) | no data | 80 °C |
| Number of transistors | 450 million | 28 million |
| 64 bit support | + | - |
| Windows 11 compatibility | - | - |
Compatibility
Information on Phenom X3 8400 and Pentium III 866 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 | 2 |
| Socket | AM2+ | 370 |
| Power consumption (TDP) | 95 Watt | 27 Watt |
Virtualization technologies
Virtual machine speed-up technologies supported by Phenom X3 8400 and Pentium III 866 are enumerated here.
| AMD-V | + | - |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | On certain motherboards (Chipset feature) |
Pros & cons summary
| Physical cores | 3 | 1 |
| Threads | 3 | 1 |
| Chip lithography | 65 nm | 180 nm |
| Power consumption (TDP) | 95 Watt | 27 Watt |
Phenom X3 8400 has 200% more physical cores and 200% more threads, and a 176.9% more advanced lithography process.
Pentium III 866, on the other hand, has 251.9% lower power consumption.
We couldn't decide between Phenom X3 8400 and Pentium III 866. We've got no test results to judge.
Should you still have questions on choice between Phenom X3 8400 and Pentium III 866, ask them in Comments section, and we shall answer.
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