Ryzen 5 7645HX vs EPYC 7551
Ryzen 5 7645HX
EPYC 7551
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 5 7645HX
Performance Per Dollar EPYC 7551
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 5 7645HX | EPYC 7551 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | Equivalent pricing | Equivalent pricing |
| Longevity | ✨ Modern (Dragon Range (Zen4) (2023) / 5 nm) | ✨ Modern (Naples (2017−2018) / 14 nm) |
💎 Value Proposition
| Insight | Ryzen 5 7645HX | EPYC 7551 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | Equivalent pricing | Equivalent pricing |
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 5 7645HX and EPYC 7551
Ryzen 5 7645HX
The Ryzen 5 7645HX is manufactured by AMD. It was released in 4 January 2023 (2 years ago). It is based on the Dragon Range (Zen4) (2023) architecture. It features 6 cores and 12 threads. Base frequency is 4 GHz, with boost up to 5 GHz. L3 cache: 32 MB (total). L2 cache: 1 MB (per core). Built on 5 nm process technology. Socket: FL1. Thermal design power (TDP): 45 Watt. Memory support: DDR5-5200. Passmark benchmark score: 26,097 points. Launch price was $299.
EPYC 7551
The EPYC 7551 is manufactured by AMD. It was released in 29 June 2017 (8 years ago). It is based on the Naples (2017−2018) architecture. It features 32 cores and 64 threads. Base frequency is 2 GHz, with boost up to 3 GHz. L3 cache: 64 MB (total). L2 cache: 512K (per core). Built on 14 nm process technology. Socket: TR4. Thermal design power (TDP): 180 Watt. Memory support: DDR4 Eight-channel. Passmark benchmark score: 25,844 points. Launch price was $3,400.
Processing Power
The Ryzen 5 7645HX packs 6 cores / 12 threads, while the EPYC 7551 offers 32 cores / 64 threads — the EPYC 7551 has 26 more cores. Boost clocks reach 5 GHz on the Ryzen 5 7645HX versus 3 GHz on the EPYC 7551 — a 50% clock advantage for the Ryzen 5 7645HX (base: 4 GHz vs 2 GHz). The Ryzen 5 7645HX uses the Dragon Range (Zen4) (2023) architecture (5 nm), while the EPYC 7551 uses Naples (2017−2018) (14 nm). In PassMark, the Ryzen 5 7645HX scores 26,097 against the EPYC 7551's 25,844 — a 1% lead for the Ryzen 5 7645HX. L3 cache: 32 MB (total) on the Ryzen 5 7645HX vs 64 MB (total) on the EPYC 7551.
| Feature | Ryzen 5 7645HX | EPYC 7551 |
|---|---|---|
| Cores / Threads | 6 / 12 | 32 / 64+433% |
| Boost Clock | 5 GHz+67% | 3 GHz |
| Base Clock | 4 GHz+100% | 2 GHz |
| L3 Cache | 32 MB (total) | 64 MB (total)+100% |
| L2 Cache | 1 MB (per core)+100% | 512K (per core) |
| Process | 5 nm-64% | 14 nm |
| Architecture | Dragon Range (Zen4) (2023) | Naples (2017−2018) |
| PassMark | 26,097 | 25,844 |
| Cinebench R23 Multi | 13,985 | — |
| Geekbench 6 Single | 2,588 | — |
| Geekbench 6 Multi | 11,717 | — |
Memory & Platform
The Ryzen 5 7645HX uses the FL1 socket (PCIe 5.0), while the EPYC 7551 uses TR4 (PCIe 4.0) — making them incompatible on the same motherboard.
| Feature | Ryzen 5 7645HX | EPYC 7551 |
|---|---|---|
| Socket | FL1 | TR4 |
| PCIe Generation | PCIe 5.0+25% | PCIe 4.0 |
| Max RAM Speed | DDR5-5200 | — |
| Max RAM Capacity | 64 GB | — |
| RAM Channels | 2 | — |
| ECC Support | ❌ | — |
| PCIe Lanes | 28 | — |
Advanced Features
Virtualization: AMD-V (SVM) (Ryzen 5 7645HX) / not specified (EPYC 7551). The Ryzen 5 7645HX includes integrated graphics (Radeon 610M), while the EPYC 7551 requires a dedicated GPU. Primary use case: Ryzen 5 7645HX targets Gaming. Direct competitor: Ryzen 5 7645HX rivals Core i5-13500HX.
| Feature | Ryzen 5 7645HX | EPYC 7551 |
|---|---|---|
| Integrated GPU | Yes | — |
| IGPU Model | Radeon 610M | — |
| Unlocked | No | — |
| AVX-512 | Yes | — |
| Virtualization | AMD-V (SVM) | — |
| Target Use | Gaming | — |
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