Ryzen 7 5800X vs Xeon E5645
Ryzen 7 5800X
Xeon E5645
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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.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Ryzen 7 5800X
Performance Per Dollar Xeon E5645
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 7 5800X | Xeon E5645 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($180) | ⚠️ Higher cost ($294) |
| Longevity | ✨ Modern (Vermeer (Zen 3) (2020−2022) / 7 nm, 12 nm) | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) |
💎 Value Proposition
| Insight | Ryzen 7 5800X | Xeon E5645 |
|---|---|---|
| Cost Efficiency | ✅ Better overall value (+816%) | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($180) | ⚠️ Higher cost ($294) |
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 Ryzen 7 5800X and Xeon E5645
Ryzen 7 5800X
The Ryzen 7 5800X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen 3) (2020−2022) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 4.7 GHz. L3 cache: 32 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4. Passmark benchmark score: 27,712 points. Launch price was $449.
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.
Processing Power
The Ryzen 7 5800X packs 8 cores / 16 threads, while the Xeon E5645 offers 6 cores / 12 threads — the Ryzen 7 5800X has 2 more cores. Boost clocks reach 4.7 GHz on the Ryzen 7 5800X versus 2.67 GHz on the Xeon E5645 — a 55.1% clock advantage for the Ryzen 7 5800X (base: 3.8 GHz vs 2.4 GHz). The Ryzen 7 5800X uses the Vermeer (Zen 3) (2020−2022) architecture (7 nm, 12 nm), while the Xeon E5645 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the Ryzen 7 5800X scores 27,712 against the Xeon E5645's 4,942 — a 139.5% lead for the Ryzen 7 5800X. L3 cache: 32 MB on the Ryzen 7 5800X vs 12 MB (total) on the Xeon E5645.
| Feature | Ryzen 7 5800X | Xeon E5645 |
|---|---|---|
| Cores / Threads | 8 / 16+33% | 6 / 12 |
| Boost Clock | 4.7 GHz+76% | 2.67 GHz |
| Base Clock | 3.8 GHz+58% | 2.4 GHz |
| L3 Cache | 32 MB+167% | 12 MB (total) |
| L2 Cache | 512K (per core)+100% | 256 kB (per core) |
| Process | 7 nm, 12 nm-78% | 32 nm |
| Architecture | Vermeer (Zen 3) (2020−2022) | Westmere-EP (2010−2011) |
| PassMark | 27,712+461% | 4,942 |
Memory & Platform
The Ryzen 7 5800X uses the AM4 socket (PCIe 4.0), while the Xeon E5645 uses LGA1366 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the Ryzen 7 5800X versus DDR3-1333 on the Xeon E5645 — the Ryzen 7 5800X supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Xeon E5645 supports up to 288 GB of RAM compared to 128 GB — 76.9% more capacity for professional workloads. Memory channels: 2 (Ryzen 7 5800X) vs 3 (Xeon E5645). PCIe lanes: 24 (Ryzen 7 5800X) vs 0 (Xeon E5645) — the Ryzen 7 5800X offers 24 more lanes for additional GPUs or NVMe drives.
| Feature | Ryzen 7 5800X | Xeon E5645 |
|---|---|---|
| Socket | AM4 | LGA1366 |
| PCIe Generation | PCIe 4.0 | PCIe 5.0+25% |
| Max RAM Speed | DDR4-3200+33% | DDR3-1333 |
| Max RAM Capacity | 128 GB | 288 GB+125% |
| RAM Channels | 2 | 3+50% |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 24 | 0 |
Advanced Features
Only the Ryzen 7 5800X has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: AMD-V (Ryzen 7 5800X) vs VT-x (Xeon E5645). Primary use case: Ryzen 7 5800X targets Desktop, Xeon E5645 targets Server.
| Feature | Ryzen 7 5800X | Xeon E5645 |
|---|---|---|
| Integrated GPU | No | No |
| Unlocked | Yes | No |
| AVX-512 | No | No |
| Virtualization | AMD-V | VT-x |
| Target Use | Desktop | Server |
Value Analysis
The Ryzen 7 5800X launched at $449 MSRP, while the Xeon E5645 debuted at $294.
| Feature | Ryzen 7 5800X | Xeon E5645 |
|---|---|---|
| MSRP | $449 | $294-35% |
| Avg Price (30d) | $180 | — |
| Release Date | 2020 | 2010 |
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