Athlon II X4 645 vs Xeon E5-2403
Athlon II X4 645
Xeon E5-2403
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 II X4 645 is positioned at rank 819 and the Xeon E5-2403 is on rank 816, so the Xeon E5-2403 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Athlon II X4 645
Performance Per Dollar Xeon E5-2403
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Athlon II X4 645 | Xeon E5-2403 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($20) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Propus (2009−2011) / 45 nm) | 🛑 Legacy (Sandy Bridge-EN (2012) / 32 nm) |
💎 Value Proposition
| Insight | Athlon II X4 645 | Xeon E5-2403 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($20) | ✅ More affordable ($0) |
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 II X4 645 and Xeon E5-2403
Athlon II X4 645
The Athlon II X4 645 is manufactured by AMD. It was released in 21 September 2010 (15 years ago). It is based on the Propus (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 3.1 GHz, with boost up to 3.1 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 2,375 points. Launch price was $80.
Xeon E5-2403
The Xeon E5-2403 is manufactured by Intel. It was released in 14 May 2012 (13 years ago). It is based on the Sandy Bridge-EN (2012) architecture. It features 4 cores and 4 threads. Base frequency is 1.8 GHz, with boost up to 1.8 GHz. L3 cache: 10240 kB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1356. Thermal design power (TDP): 80 Watt. Memory support: DDR3. Passmark benchmark score: 2,367 points. Launch price was $230.
Processing Power
Both the Athlon II X4 645 and Xeon E5-2403 share an identical 4-core/4-thread configuration. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 1.8 GHz on the Xeon E5-2403 — a 53.1% clock advantage for the Athlon II X4 645 (base: 3.1 GHz vs 1.8 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Xeon E5-2403 uses Sandy Bridge-EN (2012) (32 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Xeon E5-2403's 2,367 — a 0.3% lead for the Athlon II X4 645. L3 cache: 0 kB on the Athlon II X4 645 vs 10240 kB (total) on the Xeon E5-2403.
| Feature | Athlon II X4 645 | Xeon E5-2403 |
|---|---|---|
| Cores / Threads | 4 / 4 | 4 / 4 |
| Boost Clock | 3.1 GHz+72% | 1.8 GHz |
| Base Clock | 3.1 GHz+72% | 1.8 GHz |
| L3 Cache | 0 kB | 10240 kB (total) |
| L2 Cache | 512 kB (per core)+100% | 256 kB (per core) |
| Process | 45 nm | 32 nm-29% |
| Architecture | Propus (2009−2011) | Sandy Bridge-EN (2012) |
| PassMark | 2,375 | 2,367 |
| Cinebench R23 Multi | 1,374 | — |
| Geekbench 6 Single | 399 | — |
| Geekbench 6 Multi | 1,374 | — |
Memory & Platform
The Athlon II X4 645 uses the AM3 socket (PCIe 2.0), while the Xeon E5-2403 uses LGA1356 (PCIe 2.0) — making them incompatible on the same motherboard.
| Feature | Athlon II X4 645 | Xeon E5-2403 |
|---|---|---|
| Socket | AM3 | LGA1356 |
| PCIe Generation | PCIe 2.0 | PCIe 2.0 |
| Max RAM Speed | DDR3-1333 | — |
| Max RAM Capacity | 16 GB | — |
| RAM Channels | 2 | — |
| ECC Support | ❌ | — |
| PCIe Lanes | 16 | — |
Advanced Features
Virtualization: Yes (Athlon II X4 645) / not specified (Xeon E5-2403). Primary use case: Athlon II X4 645 targets Desktop.
| Feature | Athlon II X4 645 | Xeon E5-2403 |
|---|---|---|
| Integrated GPU | No | — |
| AVX-512 | No | — |
| Virtualization | Yes | — |
| Target Use | Desktop | — |
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