Athlon XP 2100+ vs Pentium III 1400S
Athlon XP 2100+
Pentium III 1400S
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 2100+ is positioned at rank 1139 and the Pentium III 1400S is on rank 1128, so the Pentium III 1400S 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 2100+
Performance Per Dollar Pentium III 1400S
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Athlon XP 2100+ | Pentium III 1400S |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($30) | ⚠️ Higher cost ($250) |
| Longevity | 🛑 Legacy (Thoroughbred (2001−2002) / 180 nm) | 🛑 Legacy (Tualatin (2000−2002) / 130 nm) |
💎 Value Proposition
| Insight | Athlon XP 2100+ | Pentium III 1400S |
|---|---|---|
| Cost Efficiency | ✅ Better overall value (+869%) | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($30) | ⚠️ Higher cost ($250) |
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 2100+ and Pentium III 1400S
Athlon XP 2100+
The Athlon XP 2100+ is manufactured by AMD. It was released in 2009-01-01. It is based on the Thoroughbred (2001−2002) architecture. It features 1 cores and 1 threads. Max frequency: 1.73 GHz. L3 cache: 0 kB. L2 cache: 256 kB. Built on 180 nm process technology. Socket: A. Thermal design power (TDP): 72 Watt. Passmark benchmark score: 265 points. Launch price was $149.
Pentium III 1400S
The Pentium III 1400S 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: 1.4 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA370. Thermal design power (TDP): 32 Watt. Passmark benchmark score: 228 points. Launch price was $69.
Processing Power
Both the Athlon XP 2100+ and Pentium III 1400S share an identical 1-core/1-thread configuration. Boost clocks reach 1.73 GHz on the Athlon XP 2100+ versus 1.4 GHz on the Pentium III 1400S — a 21.1% clock advantage for the Athlon XP 2100+. The Athlon XP 2100+ uses the Thoroughbred (2001−2002) architecture (180 nm), while the Pentium III 1400S uses Tualatin (2000−2002) (130 nm). In PassMark, the Athlon XP 2100+ scores 265 against the Pentium III 1400S's 228 — a 15% lead for the Athlon XP 2100+. Both processors carry 0 kB of L3 cache.
| Feature | Athlon XP 2100+ | Pentium III 1400S |
|---|---|---|
| Cores / Threads | 1 / 1 | 1 / 1 |
| Boost Clock | 1.73 GHz+24% | 1.4 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 | 265+16% | 228 |
Memory & Platform
The Athlon XP 2100+ uses the A socket (PCIe 1.1), while the Pentium III 1400S uses PGA370 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR-266 on the Athlon XP 2100+ versus PC133 on the Pentium III 1400S — the Pentium III 1400S supports -600% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 4 GB of RAM. Both feature 1-channel memory with ECC support. Both provide 0 PCIe lanes. Chipset compatibility: AMD Socket A (Athlon XP 2100+) and Intel 815,VIA Apollo Pro 133T (Pentium III 1400S).
| Feature | Athlon XP 2100+ | Pentium III 1400S |
|---|---|---|
| Socket | A | PGA370 |
| PCIe Generation | PCIe 1.1 | PCIe 1.1 |
| Max RAM Speed | DDR-266 | PC133 |
| Max RAM Capacity | 4 GB | 4 GB |
| RAM Channels | 1 | 1 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 0 | 0 |
Advanced Features
Virtualization: not specified (Athlon XP 2100+) / No (Pentium III 1400S).
| Feature | Athlon XP 2100+ | Pentium III 1400S |
|---|---|---|
| Integrated GPU | No | No |
| AVX-512 | — | No |
| Virtualization | — | No |
Value Analysis
The Athlon XP 2100+ launched at $420 MSRP, while the Pentium III 1400S debuted at $250. At current prices ($30 vs $250), the Athlon XP 2100+ is $220 cheaper. In terms of value (PassMark points per dollar), the Athlon XP 2100+ delivers 8.8 pts/$ vs 0.9 pts/$ for the Pentium III 1400S — making the Athlon XP 2100+ the 162.6% better value option.
| Feature | Athlon XP 2100+ | Pentium III 1400S |
|---|---|---|
| MSRP | $420 | $250-40% |
| Avg Price (30d) | $30-88% | $250 |
| Performance per Dollar | 8.8+878% | 0.9 |
| Release Date | 2001 | 2002 |
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