Ryzen 9 3900XT vs Ryzen 7 8745HX
Ryzen 9 3900XT
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 3900XT
Performance Per Dollar Ryzen 7 8745HX
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 9 3900XT | Ryzen 7 8745HX |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ⚠️ Higher cost ($390) | ✅ More affordable ($0) |
| Longevity | ✨ Modern (Matisse 2 (2020) / 7 nm, 12 nm) | ✨ Modern (Dragon Range (2025) / 5 nm) |
💎 Value Proposition
| Insight | Ryzen 9 3900XT | Ryzen 7 8745HX |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($390) | ✅ 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 3900XT and Ryzen 7 8745HX
Ryzen 9 3900XT
The Ryzen 9 3900XT is manufactured by AMD. It was released in 7 July 2020 (5 years ago). It is based on the Matisse 2 (2020) architecture. It features 12 cores and 24 threads. Base frequency is 3.8 GHz, with boost up to 4.7 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: 32,512 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 3900XT packs 12 cores / 24 threads, while the Ryzen 7 8745HX offers 8 cores / 16 threads — the Ryzen 9 3900XT has 4 more cores. Boost clocks reach 4.7 GHz on the Ryzen 9 3900XT versus 5.1 GHz on the Ryzen 7 8745HX — a 8.2% clock advantage for the Ryzen 7 8745HX (base: 3.8 GHz vs 3.6 GHz). The Ryzen 9 3900XT uses the Matisse 2 (2020) architecture (7 nm, 12 nm), while the Ryzen 7 8745HX uses Dragon Range (2025) (5 nm). In PassMark, the Ryzen 9 3900XT scores 32,512 against the Ryzen 7 8745HX's 32,620 — a 0.3% lead for the Ryzen 7 8745HX. Cinebench R23 multi-core: 18,400 vs 18,000 (2.2% advantage for the Ryzen 9 3900XT). Geekbench 6 single-core — the metric most relevant to gaming — records 1,750 vs 2,700, a 42.7% lead for the Ryzen 7 8745HX that directly translates to higher frame rates. Multi-core Geekbench: 10,500 vs 13,500 (25% advantage for the Ryzen 7 8745HX). L3 cache: 64 MB on the Ryzen 9 3900XT vs 32 MB (total) on the Ryzen 7 8745HX.
| Feature | Ryzen 9 3900XT | Ryzen 7 8745HX |
|---|---|---|
| Cores / Threads | 12 / 24+50% | 8 / 16 |
| Boost Clock | 4.7 GHz | 5.1 GHz+9% |
| 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 2 (2020) | Dragon Range (2025) |
| PassMark | 32,512 | 32,620 |
| Cinebench R23 Multi | 18,400+2% | 18,000 |
| Geekbench 6 Single | 1,750 | 2,700+54% |
| Geekbench 6 Multi | 10,500 | 13,500+29% |
Memory & Platform
The Ryzen 9 3900XT 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 3900XT 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 3900XT 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 3900XT) vs 28 (Ryzen 7 8745HX) — the Ryzen 7 8745HX offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: X570,B550,X470,B450 (Ryzen 9 3900XT) and FL1 (Ryzen 7 8745HX).
| Feature | Ryzen 9 3900XT | 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 3900XT requires a dedicated GPU. Primary use case: Ryzen 9 3900XT targets Workstation / Enthusiast Gaming, Ryzen 7 8745HX targets High-end Gaming Laptop. Direct competitor: Ryzen 9 3900XT rivals Core i9-10900K; Ryzen 7 8745HX rivals Core i7-14700HX.
| Feature | Ryzen 9 3900XT | Ryzen 7 8745HX |
|---|---|---|
| Integrated GPU | No | Yes |
| IGPU Model | — | Radeon 610M |
| Unlocked | Yes | Yes |
| AVX-512 | No | Yes |
| Virtualization | AMD-V | AMD-V |
| Target Use | Workstation / Enthusiast Gaming | High-end Gaming Laptop |
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