Xeon E5645 vs Xeon D-1520
Xeon E5645
Xeon D-1520
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 E5645 is positioned at rank 669 and the Xeon D-1520 is on rank 565, so the Xeon D-1520 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon E5645
Performance Per Dollar Xeon D-1520
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon E5645 | Xeon D-1520 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($294) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) | 🛑 Legacy (Broadwell (2015−2019) / 14 nm) |
💎 Value Proposition
| Insight | Xeon E5645 | Xeon D-1520 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($294) | ✅ 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 E5645 and Xeon D-1520
Xeon E5645
The Xeon E5645 is manufactured by Intel. It was released in 16 March 2010 (15 years ago). It is based on the Westmere-EP (2010−2011) architecture. It features 6 cores and 12 threads. Base frequency is 2.4 GHz, with boost up to 2.67 GHz. L3 cache: 12 MB (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: 4,942 points. Launch price was $294.
Xeon D-1520
The Xeon D-1520 is manufactured by Intel. It was released in 9 March 2015 (10 years ago). It is based on the Broadwell (2015−2019) architecture. It features 4 cores and 8 threads. Base frequency is 2.2 GHz, with boost up to 2.6 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. Passmark benchmark score: 4,917 points. Launch price was $199.
Processing Power
The Xeon E5645 packs 6 cores / 12 threads, while the Xeon D-1520 offers 4 cores / 8 threads — the Xeon E5645 has 2 more cores. Boost clocks reach 2.67 GHz on the Xeon E5645 versus 2.6 GHz on the Xeon D-1520 — a 2.7% clock advantage for the Xeon E5645 (base: 2.4 GHz vs 2.2 GHz). The Xeon E5645 uses the Westmere-EP (2010−2011) architecture (32 nm), while the Xeon D-1520 uses Broadwell (2015−2019) (14 nm). In PassMark, the Xeon E5645 scores 4,942 against the Xeon D-1520's 4,917 — a 0.5% lead for the Xeon E5645. L3 cache: 12 MB (total) on the Xeon E5645 vs 1.5 MB (per core) on the Xeon D-1520.
| Feature | Xeon E5645 | Xeon D-1520 |
|---|---|---|
| Cores / Threads | 6 / 12+50% | 4 / 8 |
| Boost Clock | 2.67 GHz+3% | 2.6 GHz |
| Base Clock | 2.4 GHz+9% | 2.2 GHz |
| L3 Cache | 12 MB (total)+700% | 1.5 MB (per core) |
| L2 Cache | 256 kB (per core) | 256K (per core) |
| Process | 32 nm | 14 nm-56% |
| Architecture | Westmere-EP (2010−2011) | Broadwell (2015−2019) |
| PassMark | 4,942 | 4,917 |
Memory & Platform
The Xeon E5645 uses the LGA1366 socket (PCIe 5.0), while the Xeon D-1520 uses FCBGA1667 (PCIe 3.0) — making them incompatible on the same motherboard.
| Feature | Xeon E5645 | Xeon D-1520 |
|---|---|---|
| Socket | LGA1366 | FCBGA1667 |
| PCIe Generation | PCIe 5.0+67% | PCIe 3.0 |
| Max RAM Speed | DDR3-1333 | — |
| Max RAM Capacity | 288 GB | — |
| RAM Channels | 3 | — |
| ECC Support | ✅ | — |
| PCIe Lanes | 0 | — |
Advanced Features
Virtualization: VT-x (Xeon E5645) / not specified (Xeon D-1520). Primary use case: Xeon E5645 targets Server.
| Feature | Xeon E5645 | Xeon D-1520 |
|---|---|---|
| Integrated GPU | No | — |
| Unlocked | No | — |
| AVX-512 | No | — |
| Virtualization | VT-x | — |
| Target Use | Server | — |
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