CPU
GPU
Ryzen 9 9955HX
Ryzen 9 9900X
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
Performance Per Dollar Ryzen 9 9900X
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 9 9955HX | Ryzen 9 9900X |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($0) | ⚠️ Higher cost ($370) |
| Longevity | ✨ Modern (Fire Range-HX (Zen 5) (2025) / 4 nm) | ✨ Modern (Granite Ridge (2024−2025) / 4 nm) |
💎 Value Proposition
| Insight | Ryzen 9 9955HX | Ryzen 9 9900X |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($0) | ⚠️ Higher cost ($370) |
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.
Path of Exile 2
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Valorant
Technical Specifications
Side-by-side comparison of Ryzen 9 9955HX and Ryzen 9 9900X
Ryzen 9 9955HX
The Ryzen 9 9955HX is manufactured by AMD. It was released in 2025-01-01. It is based on the Fire Range-HX (Zen 5) (2025) architecture. It features 16 cores and 32 threads. Base frequency is 2.5 GHz, with boost up to 5.4 GHz. L3 cache: 64 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: FL1. Thermal design power (TDP): 55 Watt. Memory support: DDR5. Passmark benchmark score: 55,711 points. Launch price was $650.
Ryzen 9 9900X
The Ryzen 9 9900X is manufactured by AMD. It was released in 15 August 2024 (1 year ago). It is based on the Granite Ridge (2024−2025) architecture. It features 12 cores and 24 threads. Base frequency is 4.4 GHz, with boost up to 5.6 GHz. L3 cache: 64 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: AM5. Thermal design power (TDP): 120 Watt. Memory support: DDR5. Passmark benchmark score: 54,530 points. Launch price was $499.
Processing Power
The Ryzen 9 9955HX packs 16 cores / 32 threads, while the Ryzen 9 9900X offers 12 cores / 24 threads — the Ryzen 9 9955HX has 4 more cores. Boost clocks reach 5.4 GHz on the Ryzen 9 9955HX versus 5.6 GHz on the Ryzen 9 9900X — a 3.6% clock advantage for the Ryzen 9 9900X (base: 2.5 GHz vs 4.4 GHz). The Ryzen 9 9955HX uses the Fire Range-HX (Zen 5) (2025) architecture (4 nm), while the Ryzen 9 9900X uses Granite Ridge (2024−2025) (4 nm). In PassMark, the Ryzen 9 9955HX scores 55,711 against the Ryzen 9 9900X's 54,530 — a 2.1% lead for the Ryzen 9 9955HX. Cinebench R23 multi-core: 38,010 vs 33,003 (14.1% advantage for the Ryzen 9 9955HX). Geekbench 6 single-core — the metric most relevant to gaming — records 3,219 vs 3,401, a 5.5% lead for the Ryzen 9 9900X that directly translates to higher frame rates. Multi-core Geekbench: 19,563 vs 19,756 (1% advantage for the Ryzen 9 9900X). Both processors carry 64 MB (total) of L3 cache.
| Feature | Ryzen 9 9955HX | Ryzen 9 9900X |
|---|---|---|
| Cores / Threads | 16 / 32+33% | 12 / 24 |
| Boost Clock | 5.4 GHz | 5.6 GHz+4% |
| Base Clock | 2.5 GHz | 4.4 GHz+76% |
| L3 Cache | 64 MB (total) | 64 MB (total) |
| L2 Cache | 1 MB (per core) | 1 MB (per core) |
| Process | 4 nm | 4 nm |
| Architecture | Fire Range-HX (Zen 5) (2025) | Granite Ridge (2024−2025) |
| PassMark | 55,711+2% | 54,530 |
| Cinebench R23 Multi | 38,010+15% | 33,003 |
| Geekbench 6 Single | 3,219 | 3,401+6% |
| Geekbench 6 Multi | 19,563 | 19,756 |
Memory & Platform
The Ryzen 9 9955HX uses the FL1 socket (PCIe 5.0), while the Ryzen 9 9900X uses AM5 (PCIe 5.0) — making them incompatible on the same motherboard. Both support up to DDR5-5600 memory speed. The Ryzen 9 9900X supports up to 256 GB of RAM compared to 96 GB — 90.9% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 28 (Ryzen 9 9955HX) vs 24 (Ryzen 9 9900X) — the Ryzen 9 9955HX offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD FL1 (Ryzen 9 9955HX) and A620,B650,X670,X870 (Ryzen 9 9900X).
| Feature | Ryzen 9 9955HX | Ryzen 9 9900X |
|---|---|---|
| Socket | FL1 | AM5 |
| PCIe Generation | PCIe 5.0 | PCIe 5.0 |
| Max RAM Speed | DDR5-5600 | DDR5-5600 |
| Max RAM Capacity | 96 GB | 256 GB+167% |
| RAM Channels | 2 | 2 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 28+17% | 24 |
Advanced Features
Both processors feature an unlocked multiplier for overclocking. Both support AVX-512 instructions, benefiting scientific computing, AI inference, and encryption workloads. Virtualization support: true (Ryzen 9 9955HX) vs AMD-V (Ryzen 9 9900X). Both include integrated graphics — Radeon 610M (Ryzen 9 9955HX) and Radeon 610M (Ryzen 9 9900X) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Direct competitor: Ryzen 9 9955HX rivals Core Ultra 9 275HX.
| Feature | Ryzen 9 9955HX | Ryzen 9 9900X |
|---|---|---|
| Integrated GPU | Yes | Yes |
| IGPU Model | Radeon 610M | Radeon 610M |
| Unlocked | Yes | Yes |
| AVX-512 | Yes | Yes |
| Virtualization | true | AMD-V |
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