Intel Pentium III 1266S vs AMD Athlon XP 1800+

Intel Pentium III 1266S
AMD Athlon XP 1800+

General info

Comparing Pentium III 1266S and Athlon XP 1800+ processor market type (desktop or notebook), architecture and sales start time and price.
Place in performance rating
Value for money (0-100)
no data
Architecture codename
Release date
July 2001
January 2001
Launch price (MSRP)
no data
Price now
no data

Technical specs

Pentium III 1266S and Athlon XP 1800+ quantitative parameters such as cores and threads number, clocks, manufacturing process, cache size and multiplier lock state. These parameters indirectly say of Pentium III 1266S and Athlon XP 1800+ performance, but for precise assessment you have to consider their test results.
Number of cores
Number of threads
Maximum frequency
1.27 GHz
1.53 GHz
L1 cache
8 KB
128 KB
L2 cache
512 KB
256 KB
Manufacturing process technology
130 nm
180 nm
Die size
80 mm2
150 mm2
Maximum case temperature (TCase)
69 °C
no data
Transistor count
44 million
37 million


Information on Pentium III 1266S and Athlon XP 1800+ compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one.
Max number of CPUs in a configuration
Power consumption (TDP)
30 Watt
66 Watt

Benchmark performance

Non-gaming benchmarks performance of Pentium III 1266S and Athlon XP 1800+. Overall benchmark performance is measured in points in 0-100 range.

Overall benchmark performance

Pentium III 1266S 0.38 +2.7%
Athlon XP 1800+ 0.37


Pentium III 1266S 309 +3%
Athlon XP 1800+ 300

Gaming performance

Let's see how good Pentium III 1266S and Athlon XP 1800+ are for gaming compared with game system requirements. Remember that sometimes official requirements may reflect real performance inaccurately.

Advantages of Intel Pentium III 1266S

2.7% faster in synthetic tests
Finer manufacturing process technology (130 vs 180 nm)
Less power hungry (30 vs 66 watts)

Advantages of AMD Athlon XP 1800+

3DNow! (older SIMD instructions set used by AMD CPUs. Supercedes MMX, works with 64-bit registers)

So, Pentium III 1266S or Athlon XP 1800+?

Technical City couldn't decide between Intel Pentium III 1266S and AMD Athlon XP 1800+. The differences in performance seem too small.
Should you still have questions on choice between Pentium III 1266S and Athlon XP 1800+, ask them in Comments section, and we shall answer.

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Intel Pentium III 1266S
AMD Athlon XP 1800+

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Advices and comments

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