CPU
GPU
Xeon L5408
Celeron 3965U
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 Xeon L5408 is positioned at rank 901 and the Celeron 3965U is on rank 265, so the Celeron 3965U offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon L5408
Performance Per Dollar Celeron 3965U
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon L5408 | Celeron 3965U |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | Equivalent pricing | Equivalent pricing |
| Longevity | 🛑 Legacy (Harpertown (2007−2008) / 45 nm) | ✨ Modern (Kaby Lake-U (2017) / 14 nm) |
💎 Value Proposition
| Insight | Xeon L5408 | Celeron 3965U |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | Equivalent pricing | Equivalent pricing |
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 Xeon L5408 and Celeron 3965U
Xeon L5408
The Xeon L5408 is manufactured by Intel. It was released in 2015-01-01. It is based on the Harpertown (2007−2008) architecture. It features 4 cores and 4 threads. Base frequency is 2.133 GHz, with boost up to 0.13 GHz. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA771. Thermal design power (TDP): 40 Watt. Memory support: DDR2, DDR3 Depends on motherboard. Passmark benchmark score: 1,769 points. Launch price was $800.
Celeron 3965U
The Celeron 3965U 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 2.2 GHz, with boost up to 2.2 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: 1,753 points. Launch price was $107.
Processing Power
The Xeon L5408 packs 4 cores / 4 threads, while the Celeron 3965U offers 2 cores / 2 threads — the Xeon L5408 has 2 more cores. Boost clocks reach 0.13 GHz on the Xeon L5408 versus 2.2 GHz on the Celeron 3965U — a 177.7% clock advantage for the Celeron 3965U (base: 2.133 GHz vs 2.2 GHz). The Xeon L5408 uses the Harpertown (2007−2008) architecture (45 nm), while the Celeron 3965U uses Kaby Lake-U (2017) (14 nm). In PassMark, the Xeon L5408 scores 1,769 against the Celeron 3965U's 1,753 — a 0.9% lead for the Xeon L5408.
| Feature | Xeon L5408 | Celeron 3965U |
|---|---|---|
| Cores / Threads | 4 / 4+100% | 2 / 2 |
| Boost Clock | 0.13 GHz | 2.2 GHz+1592% |
| Base Clock | 2.133 GHz | 2.2 GHz+3% |
| L3 Cache | — | 2 MB (total) |
| L2 Cache | 6 MB (total)+2300% | 256K (per core) |
| Process | 45 nm | 14 nm-69% |
| Architecture | Harpertown (2007−2008) | Kaby Lake-U (2017) |
| PassMark | 1,769 | 1,753 |
| Geekbench 6 Single | — | 600 |
| Geekbench 6 Multi | — | 1,200 |
Memory & Platform
The Xeon L5408 uses the LGA771 socket (PCIe 2.0), while the Celeron 3965U uses BGA1356 (PCIe 3.0) — making them incompatible on the same motherboard.
| Feature | Xeon L5408 | Celeron 3965U |
|---|---|---|
| Socket | LGA771 | 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 | — | 10 |
Advanced Features
Virtualization: not specified (Xeon L5408) / VT-x (Celeron 3965U). The Celeron 3965U includes integrated graphics (Intel HD Graphics 610), while the Xeon L5408 requires a dedicated GPU. Primary use case: Celeron 3965U targets Budget Laptop. Direct competitor: Celeron 3965U rivals Pentium Gold 4415U.
| Feature | Xeon L5408 | Celeron 3965U |
|---|---|---|
| Integrated GPU | — | Yes |
| IGPU Model | — | Intel HD Graphics 610 |
| Unlocked | — | No |
| AVX-512 | — | No |
| Virtualization | — | VT-x |
| Target Use | — | Budget Laptop |
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