Xeon D-1521 vs Xeon E5649
Xeon D-1521
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 Xeon D-1521 is positioned at rank 505 and the Xeon E5649 is on rank 938, 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 Xeon E5649
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon D-1521 | Xeon E5649 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($241) | ⚠️ Higher cost ($774) |
| Longevity | 🛑 Legacy (Broadwell (2015−2019) / 14 nm) | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) |
💎 Value Proposition
| Insight | Xeon D-1521 | Xeon E5649 |
|---|---|---|
| Cost Efficiency | ✅ Better overall value (+224%) | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($241) | ⚠️ 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 Xeon D-1521 and Xeon E5649
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.
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 Xeon D-1521 packs 4 cores / 8 threads, while the Xeon E5649 offers 6 cores / 12 threads — the Xeon E5649 has 2 more cores. Boost clocks reach 2.7 GHz on the Xeon D-1521 versus 2.93 GHz on the Xeon E5649 — a 8.2% clock advantage for the Xeon E5649 (base: 2.4 GHz vs 2.53 GHz). The Xeon D-1521 uses the Broadwell (2015−2019) architecture (14 nm), while the Xeon E5649 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the Xeon D-1521 scores 5,703 against the Xeon E5649's 5,659 — a 0.8% lead for the Xeon D-1521. L3 cache: 1.5 MB (per core) on the Xeon D-1521 vs 12288 kB (total) on the Xeon E5649.
| Feature | Xeon D-1521 | Xeon E5649 |
|---|---|---|
| Cores / Threads | 4 / 8 | 6 / 12+50% |
| Boost Clock | 2.7 GHz | 2.93 GHz+9% |
| Base Clock | 2.4 GHz | 2.53 GHz+5% |
| L3 Cache | 1.5 MB (per core) | 12288 kB (total)+700% |
| L2 Cache | 256K (per core) | 256 kB (per core) |
| Process | 14 nm-56% | 32 nm |
| Architecture | Broadwell (2015−2019) | Westmere-EP (2010−2011) |
| PassMark | 5,703 | 5,659 |
| Geekbench 6 Single | — | 415 |
| Geekbench 6 Multi | — | 2,109 |
Memory & Platform
The Xeon D-1521 uses the FCBGA1667 socket (PCIe 3.0), while the Xeon E5649 uses LGA1366 (PCIe 5.0) — making them incompatible on the same motherboard.
| Feature | Xeon D-1521 | Xeon E5649 |
|---|---|---|
| Socket | FCBGA1667 | LGA1366 |
| PCIe Generation | PCIe 3.0 | PCIe 5.0+67% |
| Max RAM Speed | — | DDR3 1333 MHz |
| Max RAM Capacity | — | 288 GB |
| RAM Channels | — | 3 |
| ECC Support | — | ✅ |
| PCIe Lanes | — | 0 |
Advanced Features
Virtualization: not specified (Xeon D-1521) / true (Xeon E5649). Primary use case: Xeon E5649 targets Server.
| Feature | Xeon D-1521 | Xeon E5649 |
|---|---|---|
| Integrated GPU | — | No |
| Unlocked | — | No |
| AVX-512 | — | No |
| Virtualization | — | true |
| Target Use | — | Server |
Value Analysis
The Xeon D-1521 launched at $199 MSRP, while the Xeon E5649 debuted at $774.
| Feature | Xeon D-1521 | Xeon E5649 |
|---|---|---|
| MSRP | $199-74% | $774 |
| Avg Price (30d) | $241 | — |
| Release Date | 2015 | 2011 |
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