Atom C3808 vs Xeon E5649
Atom C3808
Xeon E5649
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 Atom C3808 is positioned at rank 737 and the Xeon E5649 is on rank 938, 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 Atom C3808
Performance Per Dollar Xeon E5649
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Atom C3808 | Xeon E5649 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($774) |
| Longevity | ✨ Modern (Goldmont (2016−2017) / 14 nm) | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) |
💎 Value Proposition
| Insight | Atom C3808 | Xeon E5649 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($774) |
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 Atom C3808 and Xeon E5649
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.
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.
Processing Power
The Atom C3808 packs 12 cores / 12 threads, while the Xeon E5649 offers 6 cores / 12 threads — the Atom C3808 has 6 more cores. Boost clocks reach 2 GHz on the Atom C3808 versus 2.93 GHz on the Xeon E5649 — a 37.7% clock advantage for the Xeon E5649 (base: 2 GHz vs 2.53 GHz). The Atom C3808 uses the Goldmont (2016−2017) architecture (14 nm), while the Xeon E5649 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the Atom C3808 scores 5,671 against the Xeon E5649's 5,659 — a 0.2% lead for the Atom C3808. L3 cache: 12 MB on the Atom C3808 vs 12288 kB (total) on the Xeon E5649.
| Feature | Atom C3808 | Xeon E5649 |
|---|---|---|
| Cores / Threads | 12 / 12+100% | 6 / 12 |
| Boost Clock | 2 GHz | 2.93 GHz+47% |
| Base Clock | 2 GHz | 2.53 GHz+26% |
| L3 Cache | 12 MB | 12288 kB (total) |
| L2 Cache | 12 MB+4700% | 256 kB (per core) |
| Process | 14 nm-56% | 32 nm |
| Architecture | Goldmont (2016−2017) | Westmere-EP (2010−2011) |
| PassMark | 5,671 | 5,659 |
| Geekbench 6 Single | — | 415 |
| Geekbench 6 Multi | — | 2,109 |
Memory & Platform
The Atom C3808 uses the FCBGA1310 socket (PCIe 3.0), while the Xeon E5649 uses LGA1366 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 on the Atom C3808 versus DDR3 1333 MHz on the Xeon E5649 — 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: 2 (Atom C3808) vs 3 (Xeon E5649). PCIe lanes: 12 (Atom C3808) vs 0 (Xeon E5649) — the Atom C3808 offers 12 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel FCBGA1310 (Atom C3808) and Intel 5520,Intel X58 (Xeon E5649).
| Feature | Atom C3808 | Xeon E5649 |
|---|---|---|
| Socket | FCBGA1310 | LGA1366 |
| PCIe Generation | PCIe 3.0 | PCIe 5.0+67% |
| Max RAM Speed | DDR4-2133+33% | DDR3 1333 MHz |
| Max RAM Capacity | 256 GB | 288 GB+13% |
| RAM Channels | 2 | 3+50% |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 12 | 0 |
Advanced Features
Virtualization: not specified (Atom C3808) / true (Xeon E5649). Primary use case: Xeon E5649 targets Server.
| Feature | Atom C3808 | Xeon E5649 |
|---|---|---|
| Integrated GPU | No | No |
| Unlocked | — | No |
| AVX-512 | — | No |
| Virtualization | — | true |
| Target Use | — | Server |
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