CPU
GPU
Celeron 3865U
Pentium G840
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 Celeron 3865U is positioned at rank 645 and the Pentium G840 is on rank 764, so the Celeron 3865U offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Celeron 3865U
Performance Per Dollar Pentium G840
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Celeron 3865U | Pentium G840 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($15) |
| Longevity | ✨ Modern (Kaby Lake-U (2017) / 14 nm) | 🛑 Legacy (Sandy Bridge (2011−2013) / 32 nm) |
💎 Value Proposition
| Insight | Celeron 3865U | Pentium G840 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($15) |
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 Celeron 3865U and Pentium G840
Celeron 3865U
The Celeron 3865U is manufactured by Intel. It was released in 3 January 2017 (8 years ago). It is based on the Kaby Lake-U (2017) architecture. It features 2 cores and 2 threads. Base frequency is 1.8 GHz, with boost up to 1.8 GHz. L3 cache: 2 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 1,343 points. Launch price was $107.
Pentium G840
The Pentium G840 is manufactured by Intel. It was released in 22 May 2011 (14 years ago). It is based on the Sandy Bridge (2011−2013) architecture. It features 2 cores and 2 threads. Base frequency is 2.8 GHz, with boost up to 2.8 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: 1,367 points. Launch price was $60.
Processing Power
Both the Celeron 3865U and Pentium G840 share an identical 2-core/2-thread configuration. Boost clocks reach 1.8 GHz on the Celeron 3865U versus 2.8 GHz on the Pentium G840 — a 43.5% clock advantage for the Pentium G840 (base: 1.8 GHz vs 2.8 GHz). The Celeron 3865U uses the Kaby Lake-U (2017) architecture (14 nm), while the Pentium G840 uses Sandy Bridge (2011−2013) (32 nm). In PassMark, the Celeron 3865U scores 1,343 against the Pentium G840's 1,367 — a 1.8% lead for the Pentium G840. L3 cache: 2 MB (total) on the Celeron 3865U vs 3 MB (total) on the Pentium G840.
| Feature | Celeron 3865U | Pentium G840 |
|---|---|---|
| Cores / Threads | 2 / 2 | 2 / 2 |
| Boost Clock | 1.8 GHz | 2.8 GHz+56% |
| Base Clock | 1.8 GHz | 2.8 GHz+56% |
| L3 Cache | 2 MB (total) | 3 MB (total)+50% |
| L2 Cache | 256K (per core) | 256 kB (per core) |
| Process | 14 nm-56% | 32 nm |
| Architecture | Kaby Lake-U (2017) | Sandy Bridge (2011−2013) |
| PassMark | 1,343 | 1,367+2% |
| Geekbench 6 Single | 389 | — |
| Geekbench 6 Multi | 674 | — |
Memory & Platform
The Celeron 3865U uses the BGA1356 socket (PCIe 3.0), while the Pentium G840 uses LGA1155 (PCIe 2.0) — making them incompatible on the same motherboard.
| Feature | Celeron 3865U | Pentium G840 |
|---|---|---|
| Socket | BGA1356 | LGA1155 |
| PCIe Generation | PCIe 3.0+50% | PCIe 2.0 |
| Max RAM Speed | DDR4-2133 / LPDDR3-1866 | — |
| Max RAM Capacity | 32 GB | — |
| RAM Channels | 2 | — |
| ECC Support | ❌ | — |
| PCIe Lanes | 10 | — |
Advanced Features
Virtualization: VT-x / VT-d / EPT (Celeron 3865U) / not specified (Pentium G840). The Celeron 3865U includes integrated graphics (Intel HD Graphics 610), while the Pentium G840 requires a dedicated GPU. Primary use case: Celeron 3865U targets Entry-level. Direct competitor: Celeron 3865U rivals Pentium Gold 4415U.
| Feature | Celeron 3865U | Pentium G840 |
|---|---|---|
| Integrated GPU | Yes | — |
| IGPU Model | Intel HD Graphics 610 | — |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | VT-x / VT-d / EPT | — |
| Target Use | Entry-level | — |
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