Pentium III 1266S: specs and benchmarks
Aggregate performance score
Pentium III 1266S provides poor benchmark performance at 0.19% of a leader's which is a 96-core EPYC 9655P.
Summary
Intel started Pentium III 1266S sales on July 2001. This is a Tualatin architecture desktop processor primarily aimed at office systems. It has 1 core and 1 thread, and is based on 130 nm manufacturing technology, with a maximum frequency of 1266 MHz and a locked multiplier.
Compatibility-wise, this is Intel Socket 370 processor with a TDP of 30 Watt and a maximum temperature of 69 °C.
Primary details
Pentium III 1266S processor market type (desktop or notebook), architecture, sales start time and pricing.
| Place in the ranking | 3242 | |
| Place by popularity | not in top-100 | |
| Market segment | Desktop processor | |
| Power efficiency | 0.60 | of 100.00 (Ryzen Z1 Extreme) |
| Architecture codename | Tualatin (2000−2002) | |
| Release date | July 2001 (23 years ago) |
Detailed specifications
Basic microprocessor parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters can generally indicate CPU performance, but to be more precise you have to review its test results.
| Physical cores | 1 (Single-Core) | |
| Threads | 1 | |
| Boost clock speed | 1.27 GHz | of 6.2 GHz (Core i9-14900KS) |
| L1 cache | 8 KB | of 80 KB (EPYC 9965) |
| L2 cache | 512 KB | of 2 MB (Xeon 6980P) |
| L3 cache | 0 KB | of 1152 MB (EPYC 9684X) |
| Chip lithography | 130 nm | of 3 nm (Apple M3 Max 16-Core) |
| Die size | 80 mm2 | |
| Maximum case temperature (TCase) | 69 °C | of 105 °C (Core i7-5950HQ) |
| Number of transistors | 44 million | of 135,240 million (EPYC 9684X) |
| 64 bit support | - | |
| Windows 11 compatibility | - |
Compatibility
Information on Pentium III 1266S compatibility with other computer components and devices: 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 | of 8 (Opteron 842) |
| Socket | 370 | |
| Power consumption (TDP) | 30 Watt | of 500 Watt (Xeon 6960P) |
Benchmark performance
Single-core and multi-core benchmark results of Pentium III 1266S. Overall benchmark performance 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.
Send your test results of Pentium III 1266S.
AMD equivalent
According to our data, the closest AMD alternative to Pentium III 1266S is Athlon 64 2800+, which is nearly equal in speed and lower by 13 positions in our ranking.
Here are some closest AMD rivals to Pentium III 1266S:
Similar processors
Here is our recommendation of several processors that are more or less close in performance to the one reviewed.
Recommended GPUs
People consider these graphics cards to be good for Pentium III 1266S, according to our PC configuration statistics.
These are the fastest graphics cards for Pentium III 1266S in our user configuration statistics. There is a total of 6 configurations using Pentium III 1266S in our database.
