Athlon II X4 645 vs Xeon X5450
Athlon II X4 645
Xeon X5450
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 X5450 is on rank 807, so the Xeon X5450 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 X5450
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Athlon II X4 645 | Xeon X5450 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($20) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Propus (2009−2011) / 45 nm) | 🛑 Legacy (Harpertown (2007−2008) / 45 nm) |
💎 Value Proposition
| Insight | Athlon II X4 645 | Xeon X5450 |
|---|---|---|
| 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 X5450
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 X5450
The Xeon X5450 is manufactured by Intel. It was released in 11 November 2007 (18 years ago). It is based on the Harpertown (2007−2008) architecture. It features 4 cores and 4 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 12 MB L2 Cache. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA771. Thermal design power (TDP): 120 Watt. Memory support: DDR2, DDR3 Depends on motherboard. Passmark benchmark score: 2,416 points. Launch price was $851.
Processing Power
Both the Athlon II X4 645 and Xeon X5450 share an identical 4-core/4-thread configuration. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 3 GHz on the Xeon X5450 — a 3.3% clock advantage for the Athlon II X4 645 (base: 3.1 GHz vs 3 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Xeon X5450 uses Harpertown (2007−2008) (45 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Xeon X5450's 2,416 — a 1.7% lead for the Xeon X5450. L3 cache: 0 kB on the Athlon II X4 645 vs 12 MB L2 Cache on the Xeon X5450.
| Feature | Athlon II X4 645 | Xeon X5450 |
|---|---|---|
| Cores / Threads | 4 / 4 | 4 / 4 |
| Boost Clock | 3.1 GHz+3% | 3 GHz |
| Base Clock | 3.1 GHz+3% | 3 GHz |
| L3 Cache | 0 kB | 12 MB L2 Cache |
| L2 Cache | 512 kB (per core) | 6 MB (total)+1100% |
| Process | 45 nm | 45 nm |
| Architecture | Propus (2009−2011) | Harpertown (2007−2008) |
| PassMark | 2,375 | 2,416+2% |
| 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 X5450 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.
| Feature | Athlon II X4 645 | Xeon X5450 |
|---|---|---|
| Socket | AM3 | LGA771 |
| 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 X5450). Primary use case: Athlon II X4 645 targets Desktop.
| Feature | Athlon II X4 645 | Xeon X5450 |
|---|---|---|
| Integrated GPU | No | — |
| AVX-512 | No | — |
| Virtualization | Yes | — |
| Target Use | Desktop | — |
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