CPU
GPU
Athlon II X4 645
Phenom II X4 840T
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 Phenom II X4 840T is on rank 265, so the Phenom II X4 840T 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 Phenom II X4 840T
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Athlon II X4 645 | Phenom II X4 840T |
|---|---|---|
| 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 (Zosma (2010−2011) / 45 nm) |
💎 Value Proposition
| Insight | Athlon II X4 645 | Phenom II X4 840T |
|---|---|---|
| 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 Phenom II X4 840T
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.
Phenom II X4 840T
The Phenom II X4 840T is manufactured by AMD. It was released in 1 September 2010 (15 years ago). It is based on the Zosma (2010−2011) architecture. It features 4 cores and 4 threads. Base frequency is 2.9 GHz, with boost up to 3.2 GHz. L3 cache: 6 MB (total). 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: 2,367 points. Launch price was $80.
Processing Power
Both the Athlon II X4 645 and Phenom II X4 840T share an identical 4-core/4-thread configuration. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 3.2 GHz on the Phenom II X4 840T — a 3.2% clock advantage for the Phenom II X4 840T (base: 3.1 GHz vs 2.9 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Phenom II X4 840T uses Zosma (2010−2011) (45 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Phenom II X4 840T's 2,367 — a 0.3% lead for the Athlon II X4 645. L3 cache: 0 kB on the Athlon II X4 645 vs 6 MB (total) on the Phenom II X4 840T.
| Feature | Athlon II X4 645 | Phenom II X4 840T |
|---|---|---|
| Cores / Threads | 4 / 4 | 4 / 4 |
| Boost Clock | 3.1 GHz | 3.2 GHz+3% |
| Base Clock | 3.1 GHz+7% | 2.9 GHz |
| L3 Cache | 0 kB | 6 MB (total) |
| L2 Cache | 512 kB (per core) | 512 kB (per core) |
| Process | 45 nm | 45 nm |
| Architecture | Propus (2009−2011) | Zosma (2010−2011) |
| PassMark | 2,375 | 2,367 |
| Cinebench R23 Multi | 1,374 | — |
| Geekbench 6 Single | 399 | — |
| Geekbench 6 Multi | 1,374 | — |
Memory & Platform
Both processors use the AM3 socket with PCIe 2.0.
| Feature | Athlon II X4 645 | Phenom II X4 840T |
|---|---|---|
| Socket | AM3 | AM3 |
| 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 (Phenom II X4 840T). Primary use case: Athlon II X4 645 targets Desktop.
| Feature | Athlon II X4 645 | Phenom II X4 840T |
|---|---|---|
| Integrated GPU | No | — |
| AVX-512 | No | — |
| Virtualization | Yes | — |
| Target Use | Desktop | — |
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The most powerful cpus ranked by PassMark CPU Mark benchmark scores.
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