Xeon E5649 vs Atom C3808
Xeon E5649
Atom C3808
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 E5649 is positioned at rank 938 and the Atom C3808 is on rank 737, so the Atom C3808 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon E5649
Performance Per Dollar Atom C3808
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon E5649 | Atom C3808 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($774) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) | ✨ Modern (Goldmont (2016−2017) / 14 nm) |
💎 Value Proposition
| Insight | Xeon E5649 | Atom C3808 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($774) | ✅ 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 Xeon E5649 and Atom C3808
Xeon E5649
The Xeon E5649 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 6 cores and 12 threads. Base frequency is 2.53 GHz, with boost up to 2.93 GHz. L3 cache: 12288 kB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 80 Watt. Memory support: DDR3. Passmark benchmark score: 5,659 points. Launch price was $45.
Atom C3808
The Atom C3808 is manufactured by Intel. It was released in 15 August 2017 (8 years ago). It is based on the Goldmont (2016−2017) architecture. It features 12 cores and 12 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 12 MB. L2 cache: 12 MB. Built on 14 nm process technology. Socket: FCBGA1310. Thermal design power (TDP): 25 Watt. Memory support: DDR4: 2133. Passmark benchmark score: 5,671 points. Launch price was $369.
Processing Power
The Xeon E5649 packs 6 cores / 12 threads, while the Atom C3808 offers 12 cores / 12 threads — the Atom C3808 has 6 more cores. Boost clocks reach 2.93 GHz on the Xeon E5649 versus 2 GHz on the Atom C3808 — a 37.7% clock advantage for the Xeon E5649 (base: 2.53 GHz vs 2 GHz). The Xeon E5649 uses the Westmere-EP (2010−2011) architecture (32 nm), while the Atom C3808 uses Goldmont (2016−2017) (14 nm). In PassMark, the Xeon E5649 scores 5,659 against the Atom C3808's 5,671 — a 0.2% lead for the Atom C3808. L3 cache: 12288 kB (total) on the Xeon E5649 vs 12 MB on the Atom C3808.
| Feature | Xeon E5649 | Atom C3808 |
|---|---|---|
| Cores / Threads | 6 / 12 | 12 / 12+100% |
| Boost Clock | 2.93 GHz+47% | 2 GHz |
| Base Clock | 2.53 GHz+26% | 2 GHz |
| L3 Cache | 12288 kB (total) | 12 MB |
| L2 Cache | 256 kB (per core) | 12 MB+4700% |
| Process | 32 nm | 14 nm-56% |
| Architecture | Westmere-EP (2010−2011) | Goldmont (2016−2017) |
| PassMark | 5,659 | 5,671 |
| Geekbench 6 Single | 415 | — |
| Geekbench 6 Multi | 2,109 | — |
Memory & Platform
The Xeon E5649 uses the LGA1366 socket (PCIe 5.0), while the Atom C3808 uses FCBGA1310 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3 1333 MHz on the Xeon E5649 versus DDR4-2133 on the Atom C3808 — the Xeon E5649 supports 199.9% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Xeon E5649 supports up to 288 GB of RAM compared to 256 GB — 11.8% more capacity for professional workloads. Memory channels: 3 (Xeon E5649) vs 2 (Atom C3808). PCIe lanes: 0 (Xeon E5649) vs 12 (Atom C3808) — the Atom C3808 offers 12 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel 5520,Intel X58 (Xeon E5649) and Intel FCBGA1310 (Atom C3808).
| Feature | Xeon E5649 | Atom C3808 |
|---|---|---|
| Socket | LGA1366 | FCBGA1310 |
| PCIe Generation | PCIe 5.0+67% | PCIe 3.0 |
| Max RAM Speed | DDR3 1333 MHz | DDR4-2133+33% |
| Max RAM Capacity | 288 GB+13% | 256 GB |
| RAM Channels | 3+50% | 2 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 0 | 12 |
Advanced Features
Virtualization: true (Xeon E5649) / not specified (Atom C3808). Primary use case: Xeon E5649 targets Server.
| Feature | Xeon E5649 | Atom C3808 |
|---|---|---|
| Integrated GPU | No | No |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | true | — |
| Target Use | Server | — |
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