Pentium III 1266S vs Athlon 64 2800+
Aggregate performance score
Primary details
Comparing Athlon 64 2800+ and Pentium III 1266S processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 3256 | 3243 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 0.20 | 0.60 |
| Architecture codename | NewCastle (2004) | Tualatin (2000−2002) |
| Release date | April 2004 (20 years ago) | July 2001 (23 years ago) |
| Launch price (MSRP) | $100 | no data |
Detailed specifications
Athlon 64 2800+ and Pentium III 1266S 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 | 1 |
| Boost clock speed | 1.8 GHz | 1.27 GHz |
| L1 cache | 128 KB | 8 KB |
| L2 cache | 512 KB | 512 KB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 130 nm | 130 nm |
| Die size | 193 mm2 | 80 mm2 |
| Maximum case temperature (TCase) | no data | 69 °C |
| Number of transistors | 69 million | 44 million |
| 64 bit support | + | - |
| Windows 11 compatibility | - | - |
Compatibility
Information on Athlon 64 2800+ and Pentium III 1266S 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 | 754 | 370 |
| Power consumption (TDP) | 89 Watt | 30 Watt |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.
Pros & cons summary
| Power consumption (TDP) | 89 Watt | 30 Watt |
Pentium III 1266S has 196.7% lower power consumption.
Given the minimal performance differences, no clear winner can be declared between Athlon 64 2800+ and Pentium III 1266S.
Should you still have questions on choice between Athlon 64 2800+ and Pentium III 1266S, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
