CPU
GPU
Xeon D-1521
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 D-1521 is positioned at rank 505 and the Atom C3808 is on rank 737, so the Xeon D-1521 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon D-1521
Performance Per Dollar Atom C3808
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon D-1521 | Atom C3808 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($241) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Broadwell (2015−2019) / 14 nm) | ✨ Modern (Goldmont (2016−2017) / 14 nm) |
💎 Value Proposition
| Insight | Xeon D-1521 | Atom C3808 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($241) | ✅ 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 D-1521 and Atom C3808
Xeon D-1521
The Xeon D-1521 is manufactured by Intel. It was released in 1 November 2015 (10 years ago). It is based on the Broadwell (2015−2019) architecture. It features 4 cores and 8 threads. Base frequency is 2.4 GHz, with boost up to 2.7 GHz. L3 cache: 1.5 MB (per core). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: FCBGA1667. Thermal design power (TDP): 45 Watt. Memory support: DDR4, DDR3. Passmark benchmark score: 5,703 points. Launch price was $199.
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 D-1521 packs 4 cores / 8 threads, while the Atom C3808 offers 12 cores / 12 threads — the Atom C3808 has 8 more cores. Boost clocks reach 2.7 GHz on the Xeon D-1521 versus 2 GHz on the Atom C3808 — a 29.8% clock advantage for the Xeon D-1521 (base: 2.4 GHz vs 2 GHz). The Xeon D-1521 uses the Broadwell (2015−2019) architecture (14 nm), while the Atom C3808 uses Goldmont (2016−2017) (14 nm). In PassMark, the Xeon D-1521 scores 5,703 against the Atom C3808's 5,671 — a 0.6% lead for the Xeon D-1521. L3 cache: 1.5 MB (per core) on the Xeon D-1521 vs 12 MB on the Atom C3808.
| Feature | Xeon D-1521 | Atom C3808 |
|---|---|---|
| Cores / Threads | 4 / 8 | 12 / 12+200% |
| Boost Clock | 2.7 GHz+35% | 2 GHz |
| Base Clock | 2.4 GHz+20% | 2 GHz |
| L3 Cache | 1.5 MB (per core) | 12 MB+700% |
| L2 Cache | 256K (per core) | 12 MB+4700% |
| Process | 14 nm | 14 nm |
| Architecture | Broadwell (2015−2019) | Goldmont (2016−2017) |
| PassMark | 5,703 | 5,671 |
Memory & Platform
The Xeon D-1521 uses the FCBGA1667 socket (PCIe 3.0), while the Atom C3808 uses FCBGA1310 (PCIe 3.0) — making them incompatible on the same motherboard.
| Feature | Xeon D-1521 | Atom C3808 |
|---|---|---|
| Socket | FCBGA1667 | FCBGA1310 |
| PCIe Generation | PCIe 3.0 | PCIe 3.0 |
| Max RAM Speed | — | DDR4-2133 |
| Max RAM Capacity | — | 256 GB |
| RAM Channels | — | 2 |
| ECC Support | — | ✅ |
| PCIe Lanes | — | 12 |
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