Pentium III 800 vs Pentium 4 2.66
Primary details
Comparing Pentium 4 2.66 and Pentium III 800 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 3369 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 0.09 | no data |
| Architecture codename | Northwood (2002−2004) | Coppermine T (2000) |
| Release date | August 2002 (22 years ago) | no data (2024 years ago) |
Detailed specifications
Pentium 4 2.66 and Pentium III 800 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 | 2.66 GHz | 0.8 GHz |
| L1 cache | 8 KB | 8 KB |
| L2 cache | 512 KB | 256 KB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 130 nm | 180 nm |
| Die size | 146 mm2 | 80 mm2 |
| Maximum case temperature (TCase) | no data | 69 °C |
| Number of transistors | 55 million | 44 million |
| 64 bit support | - | - |
| Windows 11 compatibility | - | - |
Compatibility
Information on Pentium 4 2.66 and Pentium III 800 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 | 1 |
| Socket | 478 | 370 |
| Power consumption (TDP) | 110 Watt | 38 Watt |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium 4 2.66 and Pentium III 800. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2 | no data |
Pros & cons summary
| Chip lithography | 130 nm | 180 nm |
| Power consumption (TDP) | 110 Watt | 38 Watt |
Pentium 4 2.66 has a 38.5% more advanced lithography process.
Pentium III 800, on the other hand, has 189.5% lower power consumption.
We couldn't decide between Pentium 4 2.66 and Pentium III 800. We've got no test results to judge.
Should you still have questions on choice between Pentium 4 2.66 and Pentium III 800, ask them in Comments section, and we shall answer.
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