Athlon II X4 645 vs Celeron G3920
Athlon II X4 645
Celeron G3920
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 Celeron G3920 is on rank 364, so the Celeron G3920 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 Celeron G3920
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Athlon II X4 645 | Celeron G3920 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($20) | ⚠️ Higher cost ($30) |
| Longevity | 🛑 Legacy (Propus (2009−2011) / 45 nm) | 🛑 Legacy (Skylake (2015−2016) / 14 nm) |
💎 Value Proposition
| Insight | Athlon II X4 645 | Celeron G3920 |
|---|---|---|
| Cost Efficiency | ✅ Better overall value (+51%) | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($20) | ⚠️ Higher cost ($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 Athlon II X4 645 and Celeron G3920
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.
Celeron G3920
The Celeron G3920 is manufactured by Intel. It was released in 1 September 2015 (10 years ago). It is based on the Skylake (2015−2016) architecture. It features 2 cores and 2 threads. Base frequency is 2.9 GHz, with boost up to 2.9 GHz. L3 cache: 4 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 51 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 2,358 points. Launch price was $52.
Processing Power
The Athlon II X4 645 packs 4 cores / 4 threads, while the Celeron G3920 offers 2 cores / 2 threads — the Athlon II X4 645 has 2 more cores. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 2.9 GHz on the Celeron G3920 — a 6.7% clock advantage for the Athlon II X4 645 (base: 3.1 GHz vs 2.9 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Celeron G3920 uses Skylake (2015−2016) (14 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Celeron G3920's 2,358 — a 0.7% lead for the Athlon II X4 645. Geekbench 6 single-core — the metric most relevant to gaming — records 399 vs 699, a 54.6% lead for the Celeron G3920 that directly translates to higher frame rates. Multi-core Geekbench: 1,374 vs 948 (36.7% advantage for the Athlon II X4 645). L3 cache: 0 kB on the Athlon II X4 645 vs 4 MB (total) on the Celeron G3920.
| Feature | Athlon II X4 645 | Celeron G3920 |
|---|---|---|
| Cores / Threads | 4 / 4+100% | 2 / 2 |
| Boost Clock | 3.1 GHz+7% | 2.9 GHz |
| Base Clock | 3.1 GHz+7% | 2.9 GHz |
| L3 Cache | 0 kB | 4 MB (total) |
| L2 Cache | 512 kB (per core)+100% | 256K (per core) |
| Process | 45 nm | 14 nm-69% |
| Architecture | Propus (2009−2011) | Skylake (2015−2016) |
| PassMark | 2,375 | 2,358 |
| Cinebench R23 Multi | 1,374 | — |
| Geekbench 6 Single | 399 | 699+75% |
| Geekbench 6 Multi | 1,374+45% | 948 |
Memory & Platform
The Athlon II X4 645 uses the AM3 socket (PCIe 2.0), while the Celeron G3920 uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Athlon II X4 645 versus DDR4-2133 on the Celeron G3920 — the Celeron G3920 supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Celeron G3920 supports up to 64 GB of RAM compared to 16 GB — 120% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: AMD 700 Series,AMD 800 Series,AMD 900 Series (Athlon II X4 645) and H110,B150,H170,Z170 (Celeron G3920).
| Feature | Athlon II X4 645 | Celeron G3920 |
|---|---|---|
| Socket | AM3 | LGA1151 |
| PCIe Generation | PCIe 2.0 | PCIe 3.0+50% |
| Max RAM Speed | DDR3-1333 | DDR4-2133+33% |
| Max RAM Capacity | 16 GB | 64 GB+300% |
| RAM Channels | 2 | 2 |
| ECC Support | ❌ | ✅ |
| PCIe Lanes | 16 | 16 |
Advanced Features
Virtualization support: Yes (Athlon II X4 645) vs VT-x (Celeron G3920). The Celeron G3920 includes integrated graphics (HD Graphics 510), while the Athlon II X4 645 requires a dedicated GPU. Primary use case: Athlon II X4 645 targets Desktop, Celeron G3920 targets Budget. Direct competitor: Celeron G3920 rivals Pentium G4400.
| Feature | Athlon II X4 645 | Celeron G3920 |
|---|---|---|
| Integrated GPU | No | Yes |
| IGPU Model | — | HD Graphics 510 |
| Unlocked | — | No |
| AVX-512 | No | No |
| Virtualization | Yes | VT-x |
| Target Use | Desktop | Budget |
Value Analysis
The Athlon II X4 645 launched at $126 MSRP, while the Celeron G3920 debuted at $40. At current prices ($20 vs $30), the Athlon II X4 645 is $10 cheaper. In terms of value (PassMark points per dollar), the Athlon II X4 645 delivers 118.8 pts/$ vs 78.6 pts/$ for the Celeron G3920 — making the Athlon II X4 645 the 40.7% better value option.
| Feature | Athlon II X4 645 | Celeron G3920 |
|---|---|---|
| MSRP | $126 | $40-68% |
| Avg Price (30d) | $20-33% | $30 |
| Performance per Dollar | 118.8+51% | 78.6 |
| Release Date | 2010 | 2015 |
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