Athlon XP 1800+ vs Pentium III 1266S
Athlon XP 1800+
Pentium III 1266S
Performance Spectrum - CPU
About PassMark
PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money. The Athlon XP 1800+ is positioned at rank 1131 and the Pentium III 1266S is on rank 1140, so the Athlon XP 1800+ offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Athlon XP 1800+
Performance Per Dollar Pentium III 1266S
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Athlon XP 1800+ | Pentium III 1266S |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($30) | ✅ More affordable ($20) |
| Longevity | 🛑 Legacy (Thoroughbred (2001−2002) / 180 nm) | 🛑 Legacy (Tualatin (2000−2002) / 130 nm) |
💎 Value Proposition
| Insight | Athlon XP 1800+ | Pentium III 1266S |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+40%) |
| Upfront Cost | ⚠️ Higher cost ($30) | ✅ More affordable ($20) |
Performance Check
To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.
Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.
Technical Specifications
Side-by-side comparison of Athlon XP 1800+ and Pentium III 1266S
Athlon XP 1800+
The Athlon XP 1800+ is manufactured by AMD. It was released in Janeiro 2001 (24 years ago). It is based on the Thoroughbred (2001−2002) architecture. It features 1 cores and 1 threads. Max frequency: 1.53 GHz. L3 cache: 0 kB. L2 cache: 256 kB. Built on 180 nm process technology. Socket: A. Thermal design power (TDP): 66 Watt. Passmark benchmark score: 225 points. Launch price was $59.
Pentium III 1266S
The Pentium III 1266S is manufactured by Intel. It was released in 2007-01-01. It is based on the Tualatin (2000−2002) architecture. It features 1 cores and 1 threads. Max frequency: 1.27 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA370. Thermal design power (TDP): 30 Watt. Passmark benchmark score: 210 points. Launch price was $69.
Processing Power
Both the Athlon XP 1800+ and Pentium III 1266S share an identical 1-core/1-thread configuration. Boost clocks reach 1.53 GHz on the Athlon XP 1800+ versus 1.27 GHz on the Pentium III 1266S — a 18.6% clock advantage for the Athlon XP 1800+. The Athlon XP 1800+ uses the Thoroughbred (2001−2002) architecture (180 nm), while the Pentium III 1266S uses Tualatin (2000−2002) (130 nm). In PassMark, the Athlon XP 1800+ scores 225 against the Pentium III 1266S's 210 — a 6.9% lead for the Athlon XP 1800+. Both processors carry 0 kB of L3 cache.
| Feature | Athlon XP 1800+ | Pentium III 1266S |
|---|---|---|
| Cores / Threads | 1 / 1 | 1 / 1 |
| Boost Clock | 1.53 GHz+20% | 1.27 GHz |
| L3 Cache | 0 kB | 0 kB |
| L2 Cache | 256 kB | 512 kB+100% |
| Process | 180 nm | 130 nm-28% |
| Architecture | Thoroughbred (2001−2002) | Tualatin (2000−2002) |
| PassMark | 225+7% | 210 |
| Geekbench 6 Single | 180 | — |
| Geekbench 6 Multi | 651 | — |
Memory & Platform
The Athlon XP 1800+ uses the A socket (PCIe 1.1), while the Pentium III 1266S uses PGA370 (PCIe 1.1) — making them incompatible on the same motherboard.
| Feature | Athlon XP 1800+ | Pentium III 1266S |
|---|---|---|
| Socket | A | PGA370 |
| PCIe Generation | PCIe 1.1 | PCIe 1.1 |
| Max RAM Speed | DDR1 | — |
| Max RAM Capacity | 2 GB | — |
| RAM Channels | 1 | — |
| ECC Support | ❌ | — |
Advanced Features
Virtualization: No (Athlon XP 1800+) / not specified (Pentium III 1266S). Primary use case: Athlon XP 1800+ targets Budget. Direct competitor: Athlon XP 1800+ rivals Pentium D 830.
| Feature | Athlon XP 1800+ | Pentium III 1266S |
|---|---|---|
| Integrated GPU | No | — |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | No | — |
| Target Use | Budget | — |
Value Analysis
The Athlon XP 1800+ launched at $252 MSRP, while the Pentium III 1266S debuted at $369. At current prices ($30 vs $20), the Pentium III 1266S is $10 cheaper. In terms of value (PassMark points per dollar), the Athlon XP 1800+ delivers 7.5 pts/$ vs 10.5 pts/$ for the Pentium III 1266S — making the Pentium III 1266S the 33.3% better value option.
| Feature | Athlon XP 1800+ | Pentium III 1266S |
|---|---|---|
| MSRP | $252-32% | $369 |
| Avg Price (30d) | $30 | $20-33% |
| Performance per Dollar | 7.5 | 10.5+40% |
| Release Date | 2001 | 2001 |
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