Xeon L5639 vs Xeon X5647
Xeon L5639
Xeon X5647
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 L5639 is positioned at rank 595 and the Xeon X5647 is on rank 593, so the Xeon X5647 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon L5639
Performance Per Dollar Xeon X5647
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon L5639 | Xeon X5647 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | Equivalent pricing | Equivalent pricing |
| Longevity | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) |
💎 Value Proposition
| Insight | Xeon L5639 | Xeon X5647 |
|---|---|---|
| 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 L5639 and Xeon X5647
Xeon L5639
The Xeon L5639 is manufactured by Intel. It was released in 2015-01-01. It is based on the Westmere-EP (2010−2011) architecture. It features 6 cores and 12 threads. Base frequency is 2.133 GHz, with boost up to 2.67 GHz. L3 cache: 12 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 60 Watt. Memory support: DDR3. Passmark benchmark score: 4,419 points. Launch price was $800.
Xeon X5647
The Xeon X5647 is manufactured by Intel. It was released in 14 February 2011 (14 years ago). It is based on the Westmere-EP (2010−2011) architecture. It features 4 cores and 8 threads. Base frequency is 2.93 GHz, with boost up to 3.2 GHz. L3 cache: 12 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 130 Watt. Memory support: DDR3. Passmark benchmark score: 4,441 points. Launch price was $175.
Processing Power
The Xeon L5639 packs 6 cores / 12 threads, while the Xeon X5647 offers 4 cores / 8 threads — the Xeon L5639 has 2 more cores. Boost clocks reach 2.67 GHz on the Xeon L5639 versus 3.2 GHz on the Xeon X5647 — a 18.1% clock advantage for the Xeon X5647 (base: 2.133 GHz vs 2.93 GHz). Both are built on the Westmere-EP (2010−2011) architecture using a 32 nm process. In PassMark, the Xeon L5639 scores 4,419 against the Xeon X5647's 4,441 — a 0.5% lead for the Xeon X5647. Both processors carry 12 MB (total) of L3 cache.
| Feature | Xeon L5639 | Xeon X5647 |
|---|---|---|
| Cores / Threads | 6 / 12+50% | 4 / 8 |
| Boost Clock | 2.67 GHz | 3.2 GHz+20% |
| Base Clock | 2.133 GHz | 2.93 GHz+37% |
| L3 Cache | 12 MB (total) | 12 MB (total) |
| L2 Cache | 256 kB (per core) | 256 kB (per core) |
| Process | 32 nm | 32 nm |
| Architecture | Westmere-EP (2010−2011) | Westmere-EP (2010−2011) |
| PassMark | 4,419 | 4,441 |
Memory & Platform
Both processors use the LGA1366 socket with PCIe 4.0.
| Feature | Xeon L5639 | Xeon X5647 |
|---|---|---|
| Socket | LGA1366 | LGA1366 |
| PCIe Generation | PCIe 4.0 | PCIe 5.0+25% |
| Max RAM Speed | — | DDR3-1066 |
| RAM Channels | — | 3 |
| ECC Support | — | ✅ |
Advanced Features
Virtualization: not specified (Xeon L5639) / VT-x, VT-d (Xeon X5647). Primary use case: Xeon X5647 targets Workstation. Direct competitor: Xeon X5647 rivals Core i7-980X.
| Feature | Xeon L5639 | Xeon X5647 |
|---|---|---|
| Integrated GPU | — | No |
| Unlocked | — | No |
| AVX-512 | — | No |
| Virtualization | — | VT-x, VT-d |
| Target Use | — | Workstation |
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