CPU
GPU
Phenom II X4 840T
Athlon II X4 645
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 Phenom II X4 840T is positioned at rank 265 and the Athlon II X4 645 is on rank 819, 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 Phenom II X4 840T
Performance Per Dollar Athlon II X4 645
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Phenom II X4 840T | Athlon II X4 645 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($20) |
| Longevity | 🛑 Legacy (Zosma (2010−2011) / 45 nm) | 🛑 Legacy (Propus (2009−2011) / 45 nm) |
💎 Value Proposition
| Insight | Phenom II X4 840T | Athlon II X4 645 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($20) |
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 Phenom II X4 840T and Athlon II X4 645
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.
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.
Processing Power
Both the Phenom II X4 840T and Athlon II X4 645 share an identical 4-core/4-thread configuration. Boost clocks reach 3.2 GHz on the Phenom II X4 840T versus 3.1 GHz on the Athlon II X4 645 — a 3.2% clock advantage for the Phenom II X4 840T (base: 2.9 GHz vs 3.1 GHz). The Phenom II X4 840T uses the Zosma (2010−2011) architecture (45 nm), while the Athlon II X4 645 uses Propus (2009−2011) (45 nm). In PassMark, the Phenom II X4 840T scores 2,367 against the Athlon II X4 645's 2,375 — a 0.3% lead for the Athlon II X4 645. L3 cache: 6 MB (total) on the Phenom II X4 840T vs 0 kB on the Athlon II X4 645.
| Feature | Phenom II X4 840T | Athlon II X4 645 |
|---|---|---|
| Cores / Threads | 4 / 4 | 4 / 4 |
| Boost Clock | 3.2 GHz+3% | 3.1 GHz |
| Base Clock | 2.9 GHz | 3.1 GHz+7% |
| L3 Cache | 6 MB (total) | 0 kB |
| L2 Cache | 512 kB (per core) | 512 kB (per core) |
| Process | 45 nm | 45 nm |
| Architecture | Zosma (2010−2011) | Propus (2009−2011) |
| PassMark | 2,367 | 2,375 |
| 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 | Phenom II X4 840T | Athlon II X4 645 |
|---|---|---|
| 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: not specified (Phenom II X4 840T) / Yes (Athlon II X4 645). Primary use case: Athlon II X4 645 targets Desktop.
| Feature | Phenom II X4 840T | Athlon II X4 645 |
|---|---|---|
| Integrated GPU | — | No |
| AVX-512 | — | No |
| Virtualization | — | Yes |
| Target Use | — | Desktop |
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