Pentium III 1400S vs Athlon XP 2100+
Pentium III 1400S
Athlon XP 2100+
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 Pentium III 1400S is positioned at rank 1128 and the Athlon XP 2100+ is on rank 1139, 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 Pentium III 1400S
Performance Per Dollar Athlon XP 2100+
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Pentium III 1400S | Athlon XP 2100+ |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($250) | ✅ More affordable ($30) |
| Longevity | 🛑 Legacy (Tualatin (2000−2002) / 130 nm) | 🛑 Legacy (Thoroughbred (2001−2002) / 180 nm) |
💎 Value Proposition
| Insight | Pentium III 1400S | Athlon XP 2100+ |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+869%) |
| Upfront Cost | ⚠️ Higher cost ($250) | ✅ More affordable ($30) |
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 Pentium III 1400S and Athlon XP 2100+
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.
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.
Processing Power
Both the Pentium III 1400S and Athlon XP 2100+ share an identical 1-core/1-thread configuration. Boost clocks reach 1.4 GHz on the Pentium III 1400S versus 1.73 GHz on the Athlon XP 2100+ — a 21.1% clock advantage for the Athlon XP 2100+. The Pentium III 1400S uses the Tualatin (2000−2002) architecture (130 nm), while the Athlon XP 2100+ uses Thoroughbred (2001−2002) (180 nm). In PassMark, the Pentium III 1400S scores 228 against the Athlon XP 2100+'s 265 — a 15% lead for the Athlon XP 2100+. Both processors carry 0 kB of L3 cache.
| Feature | Pentium III 1400S | Athlon XP 2100+ |
|---|---|---|
| Cores / Threads | 1 / 1 | 1 / 1 |
| Boost Clock | 1.4 GHz | 1.73 GHz+24% |
| L3 Cache | 0 kB | 0 kB |
| L2 Cache | 512 kB+100% | 256 kB |
| Process | 130 nm-28% | 180 nm |
| Architecture | Tualatin (2000−2002) | Thoroughbred (2001−2002) |
| PassMark | 228 | 265+16% |
Memory & Platform
The Pentium III 1400S uses the PGA370 socket (PCIe 1.1), while the Athlon XP 2100+ uses A (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches PC133 on the Pentium III 1400S versus DDR-266 on the Athlon XP 2100+ — 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: Intel 815,VIA Apollo Pro 133T (Pentium III 1400S) and AMD Socket A (Athlon XP 2100+).
| Feature | Pentium III 1400S | Athlon XP 2100+ |
|---|---|---|
| Socket | PGA370 | A |
| PCIe Generation | PCIe 1.1 | PCIe 1.1 |
| Max RAM Speed | PC133 | DDR-266 |
| Max RAM Capacity | 4 GB | 4 GB |
| RAM Channels | 1 | 1 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 0 | 0 |
Advanced Features
Virtualization: No (Pentium III 1400S) / not specified (Athlon XP 2100+).
| Feature | Pentium III 1400S | Athlon XP 2100+ |
|---|---|---|
| Integrated GPU | No | No |
| AVX-512 | No | — |
| Virtualization | No | — |
Value Analysis
The Pentium III 1400S launched at $250 MSRP, while the Athlon XP 2100+ debuted at $420. At current prices ($250 vs $30), the Athlon XP 2100+ is $220 cheaper. In terms of value (PassMark points per dollar), the Pentium III 1400S delivers 0.9 pts/$ vs 8.8 pts/$ for the Athlon XP 2100+ — making the Athlon XP 2100+ the 162.6% better value option.
| Feature | Pentium III 1400S | Athlon XP 2100+ |
|---|---|---|
| MSRP | $250-40% | $420 |
| Avg Price (30d) | $250 | $30-88% |
| Performance per Dollar | 0.9 | 8.8+878% |
| Release Date | 2002 | 2001 |
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