Ryzen 9 3900X vs Ryzen 7 8745HX
Ryzen 9 3900X
Ryzen 7 8745HX
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 3900X
Performance Per Dollar Ryzen 7 8745HX
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 9 3900X | Ryzen 7 8745HX |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($441) | ✅ More affordable ($0) |
| Longevity | ✨ Modern (Matisse (Zen 2) (2019−2020) / 7 nm, 12 nm) | ✨ Modern (Dragon Range (2025) / 5 nm) |
💎 Value Proposition
| Insight | Ryzen 9 3900X | Ryzen 7 8745HX |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($441) | ✅ More affordable ($0) |
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 3900X and Ryzen 7 8745HX
Ryzen 9 3900X
The Ryzen 9 3900X is manufactured by AMD. It was released in 7 July 2019 (6 years ago). It is based on the Matisse (Zen 2) (2019−2020) architecture. It features 12 cores and 24 threads. Base frequency is 3.8 GHz, with boost up to 4.6 GHz. L3 cache: 64 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 125 Watt. Memory support: DDR4 Dual-channel. Passmark benchmark score: 32,517 points. Launch price was $499.
Ryzen 7 8745HX
The Ryzen 7 8745HX is manufactured by AMD. It was released in 23 April 2025 (less than a year ago). It is based on the Dragon Range (2025) architecture. It features 8 cores and 16 threads. Base frequency is 3.6 GHz, with boost up to 5.1 GHz. L3 cache: 32 MB (total). L2 cache: 1 MB (per core). Built on 5 nm process technology. Socket: FL1. Thermal design power (TDP): 55 Watt. Memory support: DDR5. Passmark benchmark score: 32,620 points. Launch price was $499.
Processing Power
The Ryzen 9 3900X packs 12 cores / 24 threads, while the Ryzen 7 8745HX offers 8 cores / 16 threads — the Ryzen 9 3900X has 4 more cores. Boost clocks reach 4.6 GHz on the Ryzen 9 3900X versus 5.1 GHz on the Ryzen 7 8745HX — a 10.3% clock advantage for the Ryzen 7 8745HX (base: 3.8 GHz vs 3.6 GHz). The Ryzen 9 3900X uses the Matisse (Zen 2) (2019−2020) architecture (7 nm, 12 nm), while the Ryzen 7 8745HX uses Dragon Range (2025) (5 nm). In PassMark, the Ryzen 9 3900X scores 32,517 against the Ryzen 7 8745HX's 32,620 — a 0.3% lead for the Ryzen 7 8745HX. Geekbench 6 single-core — the metric most relevant to gaming — records 1,300 vs 2,700, a 70% lead for the Ryzen 7 8745HX that directly translates to higher frame rates. Multi-core Geekbench: 12,000 vs 13,500 (11.8% advantage for the Ryzen 7 8745HX). L3 cache: 64 MB on the Ryzen 9 3900X vs 32 MB (total) on the Ryzen 7 8745HX.
| Feature | Ryzen 9 3900X | Ryzen 7 8745HX |
|---|---|---|
| Cores / Threads | 12 / 24+50% | 8 / 16 |
| Boost Clock | 4.6 GHz | 5.1 GHz+11% |
| Base Clock | 3.8 GHz+6% | 3.6 GHz |
| L3 Cache | 64 MB+100% | 32 MB (total) |
| L2 Cache | 512K (per core) | 1 MB (per core)+100% |
| Process | 7 nm, 12 nm | 5 nm-29% |
| Architecture | Matisse (Zen 2) (2019−2020) | Dragon Range (2025) |
| PassMark | 32,517 | 32,620 |
| Cinebench R23 Multi | — | 18,000 |
| Geekbench 6 Single | 1,300 | 2,700+108% |
| Geekbench 6 Multi | 12,000 | 13,500+13% |
Memory & Platform
The Ryzen 9 3900X uses the AM4 socket (PCIe 4.0), while the Ryzen 7 8745HX uses FL1 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the Ryzen 9 3900X versus DDR5-5200 on the Ryzen 7 8745HX — the Ryzen 7 8745HX supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 9 3900X supports up to 128 GB of RAM compared to 64 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 24 (Ryzen 9 3900X) vs 28 (Ryzen 7 8745HX) — the Ryzen 7 8745HX offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: X570,B550 (Ryzen 9 3900X) and FL1 (Ryzen 7 8745HX).
| Feature | Ryzen 9 3900X | Ryzen 7 8745HX |
|---|---|---|
| Socket | AM4 | FL1 |
| PCIe Generation | PCIe 4.0 | PCIe 4.0 |
| Max RAM Speed | DDR4-3200 | DDR5-5200+25% |
| Max RAM Capacity | 128 GB+100% | 64 GB |
| RAM Channels | 2 | 2 |
| ECC Support | ✅ | ❌ |
| PCIe Lanes | 24 | 28+17% |
Advanced Features
Both processors feature an unlocked multiplier for overclocking. Only the Ryzen 7 8745HX supports AVX-512 instructions — important for machine learning and scientific applications. Both support AMD-V virtualization. The Ryzen 7 8745HX includes integrated graphics (Radeon 610M), while the Ryzen 9 3900X requires a dedicated GPU. Primary use case: Ryzen 9 3900X targets Workstation, Ryzen 7 8745HX targets High-end Gaming Laptop. Direct competitor: Ryzen 7 8745HX rivals Core i7-14700HX.
| Feature | Ryzen 9 3900X | Ryzen 7 8745HX |
|---|---|---|
| Integrated GPU | No | Yes |
| IGPU Model | None | Radeon 610M |
| Unlocked | Yes | Yes |
| AVX-512 | No | Yes |
| Virtualization | AMD-V | AMD-V |
| Target Use | Workstation | High-end Gaming Laptop |
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