CPU
GPU
Xeon X5647
Phenom II X3 P840
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 X5647 is positioned at rank 593 and the Phenom II X3 P840 is on rank 45, so the Phenom II X3 P840 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon X5647
Performance Per Dollar Phenom II X3 P840
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon X5647 | Phenom II X3 P840 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | Equivalent pricing | Equivalent pricing |
| Longevity | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) | 🛑 Legacy (Champlain (2010−2011) / 45 nm) |
💎 Value Proposition
| Insight | Xeon X5647 | Phenom II X3 P840 |
|---|---|---|
| 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 X5647 and Phenom II X3 P840
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.
Phenom II X3 P840
The Phenom II X3 P840 is manufactured by AMD. It was released in 2009-01-01. It is based on the Champlain (2010−2011) architecture. It features 3 cores and 3 threads. Max frequency: 1.9 GHz. L2 cache: 1.5 MB. Built on 45 nm process technology. Socket: S1. Thermal design power (TDP): 1.5 MB. Memory support: DDR3. Passmark benchmark score: 4,425 points. Launch price was $149.
Processing Power
The Xeon X5647 packs 4 cores / 8 threads, while the Phenom II X3 P840 offers 3 cores / 3 threads — the Xeon X5647 has 1 more core. Boost clocks reach 3.2 GHz on the Xeon X5647 versus 1.9 GHz on the Phenom II X3 P840 — a 51% clock advantage for the Xeon X5647. The Xeon X5647 uses the Westmere-EP (2010−2011) architecture (32 nm), while the Phenom II X3 P840 uses Champlain (2010−2011) (45 nm). In PassMark, the Xeon X5647 scores 4,441 against the Phenom II X3 P840's 4,425 — a 0.4% lead for the Xeon X5647.
| Feature | Xeon X5647 | Phenom II X3 P840 |
|---|---|---|
| Cores / Threads | 4 / 8+33% | 3 / 3 |
| Boost Clock | 3.2 GHz+68% | 1.9 GHz |
| Base Clock | 2.93 GHz | — |
| L3 Cache | 12 MB (total) | — |
| L2 Cache | 256 kB (per core) | 1.5 MB+500% |
| Process | 32 nm-29% | 45 nm |
| Architecture | Westmere-EP (2010−2011) | Champlain (2010−2011) |
| PassMark | 4,441 | 4,425 |
Memory & Platform
The Xeon X5647 uses the LGA1366 socket (PCIe 5.0), while the Phenom II X3 P840 uses S1 (PCIe 2.0) — making them incompatible on the same motherboard.
| Feature | Xeon X5647 | Phenom II X3 P840 |
|---|---|---|
| Socket | LGA1366 | S1 |
| PCIe Generation | PCIe 5.0+150% | PCIe 2.0 |
| Max RAM Speed | DDR3-1066 | — |
| RAM Channels | 3 | — |
| ECC Support | ✅ | — |
Advanced Features
Virtualization: VT-x, VT-d (Xeon X5647) / not specified (Phenom II X3 P840). Primary use case: Xeon X5647 targets Workstation. Direct competitor: Xeon X5647 rivals Core i7-980X.
| Feature | Xeon X5647 | Phenom II X3 P840 |
|---|---|---|
| Integrated GPU | No | — |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | VT-x, VT-d | — |
| Target Use | Workstation | — |
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