Pentium G645 vs Celeron 3955U
Pentium G645
Celeron 3955U
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 Pentium G645 is positioned at rank 838 and the Celeron 3955U is on rank 616, so the Celeron 3955U offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Pentium G645
Performance Per Dollar Celeron 3955U
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Pentium G645 | Celeron 3955U |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($15) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Sandy Bridge (2011−2013) / 32 nm) | 🛑 Legacy (Skylake (2015−2016) / 14 nm) |
💎 Value Proposition
| Insight | Pentium G645 | Celeron 3955U |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($15) | ✅ 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 Pentium G645 and Celeron 3955U
Pentium G645
The Pentium G645 is manufactured by Intel. It was released in 2 September 2012 (13 years ago). It is based on the Sandy Bridge (2011−2013) architecture. It features 2 cores and 2 threads. Base frequency is 2.9 GHz, with boost up to 2.9 GHz. L3 cache: 3 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1155. Thermal design power (TDP): 65 Watt. Memory support: DDR3. Passmark benchmark score: 1,450 points. Launch price was $80.
Celeron 3955U
The Celeron 3955U is manufactured by Intel. It was released in 15 August 2015 (10 years ago). It is based on the Skylake (2015−2016) architecture. It features 2 cores and 2 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 2 MB. L2 cache: 512 kB. Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR4-1866/2133, LPDDR3-1600/1866, DDR3L-1333/1600. Passmark benchmark score: 1,443 points. Launch price was $107.
Processing Power
Both the Pentium G645 and Celeron 3955U share an identical 2-core/2-thread configuration. Boost clocks reach 2.9 GHz on the Pentium G645 versus 2 GHz on the Celeron 3955U — a 36.7% clock advantage for the Pentium G645 (base: 2.9 GHz vs 2 GHz). The Pentium G645 uses the Sandy Bridge (2011−2013) architecture (32 nm), while the Celeron 3955U uses Skylake (2015−2016) (14 nm). In PassMark, the Pentium G645 scores 1,450 against the Celeron 3955U's 1,443 — a 0.5% lead for the Pentium G645. L3 cache: 3 MB (total) on the Pentium G645 vs 2 MB on the Celeron 3955U.
| Feature | Pentium G645 | Celeron 3955U |
|---|---|---|
| Cores / Threads | 2 / 2 | 2 / 2 |
| Boost Clock | 2.9 GHz+45% | 2 GHz |
| Base Clock | 2.9 GHz+45% | 2 GHz |
| L3 Cache | 3 MB (total)+50% | 2 MB |
| L2 Cache | 256 kB (per core) | 512 kB+100% |
| Process | 32 nm | 14 nm-56% |
| Architecture | Sandy Bridge (2011−2013) | Skylake (2015−2016) |
| PassMark | 1,450 | 1,443 |
| Geekbench 6 Single | — | 431 |
| Geekbench 6 Multi | — | 741 |
Memory & Platform
The Pentium G645 uses the LGA1155 socket (PCIe 2.0), while the Celeron 3955U uses BGA1356 (PCIe 3.0) — making them incompatible on the same motherboard.
| Feature | Pentium G645 | Celeron 3955U |
|---|---|---|
| Socket | LGA1155 | BGA1356 |
| PCIe Generation | PCIe 2.0 | PCIe 3.0+50% |
| Max RAM Speed | — | DDR4-2133 |
| Max RAM Capacity | — | 32 GB |
| RAM Channels | — | 2 |
| ECC Support | — | ❌ |
| PCIe Lanes | — | 12 |
Advanced Features
Virtualization: not specified (Pentium G645) / VT-x, VT-d (Celeron 3955U). The Celeron 3955U includes integrated graphics (HD Graphics 510), while the Pentium G645 requires a dedicated GPU. Primary use case: Celeron 3955U targets Budget. Direct competitor: Celeron 3955U rivals Pentium 3825U.
| Feature | Pentium G645 | Celeron 3955U |
|---|---|---|
| Integrated GPU | — | Yes |
| IGPU Model | — | HD Graphics 510 |
| Unlocked | — | No |
| AVX-512 | — | No |
| Virtualization | — | VT-x, VT-d |
| Target Use | — | Budget |
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