Xeon E5645 vs Ryzen 9 5900X
Xeon E5645
Ryzen 9 5900X
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. The Xeon E5645 is positioned at rank #669 in our cost-efficiency ranking, representing a Lower cost-benefit for your build. 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 Xeon E5645
Performance Per Dollar Ryzen 9 5900X
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon E5645 | Ryzen 9 5900X |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ✅ More affordable ($294) | ⚠️ Higher cost ($350) |
| Longevity | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) | ✨ Modern (Vermeer (Zen3) (2020−2022) / 7 nm, 12 nm) |
💎 Value Proposition
| Insight | Xeon E5645 | Ryzen 9 5900X |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+562%) |
| Upfront Cost | ✅ More affordable ($294) | ⚠️ Higher cost ($350) |
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 Ryzen 9 5900X
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.
Ryzen 9 5900X
The Ryzen 9 5900X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen3) (2020−2022) architecture. It features 12 cores and 24 threads. Base frequency is 3.7 GHz, with boost up to 4.8 GHz. L3 cache: 64 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4-3200. Passmark benchmark score: 38,955 points. Launch price was $549.
Processing Power
The Xeon E5645 packs 6 cores / 12 threads, while the Ryzen 9 5900X offers 12 cores / 24 threads — the Ryzen 9 5900X has 6 more cores. Boost clocks reach 2.67 GHz on the Xeon E5645 versus 4.8 GHz on the Ryzen 9 5900X — a 57% clock advantage for the Ryzen 9 5900X (base: 2.4 GHz vs 3.7 GHz). The Xeon E5645 uses the Westmere-EP (2010−2011) architecture (32 nm), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Xeon E5645 scores 4,942 against the Ryzen 9 5900X's 38,955 — a 155% lead for the Ryzen 9 5900X. L3 cache: 12 MB (total) on the Xeon E5645 vs 64 MB on the Ryzen 9 5900X.
| Feature | Xeon E5645 | Ryzen 9 5900X |
|---|---|---|
| Cores / Threads | 6 / 12 | 12 / 24+100% |
| Boost Clock | 2.67 GHz | 4.8 GHz+80% |
| Base Clock | 2.4 GHz | 3.7 GHz+54% |
| L3 Cache | 12 MB (total) | 64 MB+433% |
| L2 Cache | 256 kB (per core) | 512K (per core)+100% |
| Process | 32 nm | 7 nm, 12 nm-78% |
| Architecture | Westmere-EP (2010−2011) | Vermeer (Zen3) (2020−2022) |
| PassMark | 4,942 | 38,955+688% |
| Cinebench R23 Multi | — | 21,000 |
| Geekbench 6 Single | — | 2,174 |
| Geekbench 6 Multi | — | 11,888 |
Memory & Platform
The Xeon E5645 uses the LGA1366 socket (PCIe 5.0), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Xeon E5645 versus DDR4-3200 on the Ryzen 9 5900X — the Ryzen 9 5900X 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: 3 (Xeon E5645) vs 2 (Ryzen 9 5900X). PCIe lanes: 0 (Xeon E5645) vs 24 (Ryzen 9 5900X) — the Ryzen 9 5900X offers 24 more lanes for additional GPUs or NVMe drives.
| Feature | Xeon E5645 | Ryzen 9 5900X |
|---|---|---|
| Socket | LGA1366 | AM4 |
| PCIe Generation | PCIe 5.0+25% | PCIe 4.0 |
| Max RAM Speed | DDR3-1333 | DDR4-3200+33% |
| Max RAM Capacity | 288 GB+125% | 128 GB |
| RAM Channels | 3+50% | 2 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 0 | 24 |
Advanced Features
Only the Ryzen 9 5900X has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: VT-x (Xeon E5645) vs AMD-V (Ryzen 9 5900X). Primary use case: Xeon E5645 targets Server, Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.
| Feature | Xeon E5645 | Ryzen 9 5900X |
|---|---|---|
| Integrated GPU | No | No |
| Unlocked | No | Yes |
| AVX-512 | No | No |
| Virtualization | VT-x | AMD-V |
| Target Use | Server | Workstation |
Value Analysis
The Xeon E5645 launched at $294 MSRP, while the Ryzen 9 5900X debuted at $549.
| Feature | Xeon E5645 | Ryzen 9 5900X |
|---|---|---|
| MSRP | $294-46% | $549 |
| Avg Price (30d) | — | $350 |
| Release Date | 2010 | 2020 |
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