Ryzen 9 5900HX vs Ryzen 5 8645HS
Ryzen 9 5900HX
Ryzen 5 8645HS
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 9 5900HX
Performance Per Dollar Ryzen 5 8645HS
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 9 5900HX | Ryzen 5 8645HS |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | Equivalent pricing | Equivalent pricing |
| Longevity | ✨ Modern (Cezanne-H (Zen 3) (2021) / 7 nm) | ✨ Modern (Hawk Point-HS (Zen 4) (2023−2024) / 4 nm) |
💎 Value Proposition
| Insight | Ryzen 9 5900HX | Ryzen 5 8645HS |
|---|---|---|
| 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 9 5900HX and Ryzen 5 8645HS
Ryzen 9 5900HX
The Ryzen 9 5900HX is manufactured by AMD. It was released in 12 January 2021 (4 years ago). It is based on the Cezanne-H (Zen 3) (2021) architecture. It features 8 cores and 16 threads. Base frequency is 3.3 GHz, with boost up to 4.6 GHz. L3 cache: 16 MB (total). L2 cache: 512K (per core). Built on 7 nm process technology. Socket: FP6. Thermal design power (TDP): 45 Watt. Memory support: DDR4. Passmark benchmark score: 22,198 points. Launch price was $299.
Ryzen 5 8645HS
The Ryzen 5 8645HS is manufactured by AMD. It was released in 6 December 2023 (1 year ago). It is based on the Hawk Point-HS (Zen 4) (2023−2024) architecture. It features 6 cores and 12 threads. Base frequency is 4.3 GHz, with boost up to 5 GHz. L3 cache: 16 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: FP8. Thermal design power (TDP): 45 Watt. Memory support: DDR5. Passmark benchmark score: 22,257 points. Launch price was $299.
Processing Power
The Ryzen 9 5900HX packs 8 cores / 16 threads, while the Ryzen 5 8645HS offers 6 cores / 12 threads — the Ryzen 9 5900HX has 2 more cores. Boost clocks reach 4.6 GHz on the Ryzen 9 5900HX versus 5 GHz on the Ryzen 5 8645HS — a 8.3% clock advantage for the Ryzen 5 8645HS (base: 3.3 GHz vs 4.3 GHz). The Ryzen 9 5900HX uses the Cezanne-H (Zen 3) (2021) architecture (7 nm), while the Ryzen 5 8645HS uses Hawk Point-HS (Zen 4) (2023−2024) (4 nm). In PassMark, the Ryzen 9 5900HX scores 22,198 against the Ryzen 5 8645HS's 22,257 — a 0.3% lead for the Ryzen 5 8645HS. Cinebench R23 multi-core: 13,955 vs 13,316 (4.7% advantage for the Ryzen 9 5900HX). Geekbench 6 single-core — the metric most relevant to gaming — records 1,845 vs 2,574, a 33% lead for the Ryzen 5 8645HS that directly translates to higher frame rates. Multi-core Geekbench: 7,587 vs 10,675 (33.8% advantage for the Ryzen 5 8645HS). Both processors carry 16 MB (total) of L3 cache.
| Feature | Ryzen 9 5900HX | Ryzen 5 8645HS |
|---|---|---|
| Cores / Threads | 8 / 16+33% | 6 / 12 |
| Boost Clock | 4.6 GHz | 5 GHz+9% |
| Base Clock | 3.3 GHz | 4.3 GHz+30% |
| L3 Cache | 16 MB (total) | 16 MB (total) |
| L2 Cache | 512K (per core) | 1 MB (per core)+100% |
| Process | 7 nm | 4 nm-43% |
| Architecture | Cezanne-H (Zen 3) (2021) | Hawk Point-HS (Zen 4) (2023−2024) |
| PassMark | 22,198 | 22,257 |
| Cinebench R23 Multi | 13,955+5% | 13,316 |
| Geekbench 6 Single | 1,845 | 2,574+40% |
| Geekbench 6 Multi | 7,587 | 10,675+41% |
Memory & Platform
The Ryzen 9 5900HX uses the FP6 socket (PCIe 4.0), while the Ryzen 5 8645HS uses FP8 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200, LPDDR4-4266 on the Ryzen 9 5900HX versus LPDDR5x-7500 on the Ryzen 5 8645HS — the Ryzen 5 8645HS supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 5 8645HS supports up to 256 GB of RAM compared to 64 GB — 120% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Ryzen 9 5900HX) vs 20 (Ryzen 5 8645HS) — the Ryzen 5 8645HS offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FP6 (Ryzen 9 5900HX) and SoC (Ryzen 5 8645HS).
| Feature | Ryzen 9 5900HX | Ryzen 5 8645HS |
|---|---|---|
| Socket | FP6 | FP8 |
| PCIe Generation | PCIe 4.0 | PCIe 4.0 |
| Max RAM Speed | DDR4-3200, LPDDR4-4266 | LPDDR5x-7500+25% |
| Max RAM Capacity | 64 GB | 256 GB+300% |
| RAM Channels | 2 | 2 |
| ECC Support | ❌ | ✅ |
| PCIe Lanes | 16 | 20+25% |
Advanced Features
Only the Ryzen 9 5900HX has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Ryzen 5 8645HS supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: AMD-V (Ryzen 9 5900HX) vs AMD-V (SVM) (Ryzen 5 8645HS). Both include integrated graphics — Radeon RX Vega 8 (Ryzen 9 5900HX) and Radeon 760M (Ryzen 5 8645HS) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Ryzen 9 5900HX targets Gaming Laptop / Mobile Workstation, Ryzen 5 8645HS targets Gaming. Direct competitor: Ryzen 9 5900HX rivals Core i9-11980HK; Ryzen 5 8645HS rivals Core i5-13500H.
| Feature | Ryzen 9 5900HX | Ryzen 5 8645HS |
|---|---|---|
| Integrated GPU | Yes | Yes |
| IGPU Model | Radeon RX Vega 8 | Radeon 760M |
| Unlocked | Yes | No |
| AVX-512 | No | Yes |
| Virtualization | AMD-V | AMD-V (SVM) |
| Target Use | Gaming Laptop / Mobile Workstation | Gaming |
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