Ryzen 9 3900XT vs Ryzen 7 7745HX
Ryzen 9 3900XT
Ryzen 7 7745HX
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
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Performance Per Dollar Ryzen 9 3900XT
Performance Per Dollar
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 9 3900XT | Ryzen 7 7745HX |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($390) | ✅ More affordable ($0) |
| Longevity | ✨ Modern (Matisse 2 (2020) / 7 nm, 12 nm) | ✨ Modern (Dragon Range (Zen 4) (2023) / CCD = 5 nm, I/O = 6 nm) |
💎 Value Proposition
| Insight | Ryzen 9 3900XT | Ryzen 7 7745HX |
|---|---|---|
| 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 7745HX
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 7745HX
The Ryzen 7 7745HX is manufactured by AMD. It was released in 4 January 2023 (2 years ago). It is based on the Dragon Range (Zen 4) (2023) 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 CCD = 5 nm, I/O = 6 nm process technology. Socket: FL1. Thermal design power (TDP): 55 Watt. Memory support: DDR5. Passmark benchmark score: 32,515 points. Launch price was $499.
Processing Power
The Ryzen 9 3900XT packs 12 cores / 24 threads, while the Ryzen 7 7745HX 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 7745HX — a 8.2% clock advantage for the Ryzen 7 7745HX (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 7745HX uses Dragon Range (Zen 4) (2023) (CCD = 5 nm, I/O = 6 nm). In PassMark, the Ryzen 9 3900XT scores 32,512 against the Ryzen 7 7745HX's 32,515 — a 0% lead for the Ryzen 7 7745HX. Cinebench R23 multi-core: 18,400 vs 18,606 (1.1% advantage for the Ryzen 7 7745HX). Geekbench 6 single-core — the metric most relevant to gaming — records 1,750 vs 2,623, a 39.9% lead for the Ryzen 7 7745HX that directly translates to higher frame rates. Multi-core Geekbench: 10,500 vs 14,000 (28.6% advantage for the Ryzen 7 7745HX). L3 cache: 64 MB on the Ryzen 9 3900XT vs 32 MB (total) on the Ryzen 7 7745HX.
| Feature | Ryzen 9 3900XT | Ryzen 7 7745HX |
|---|---|---|
| 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 | CCD = 5 nm, I/O = 6 nm-29% |
| Architecture | Matisse 2 (2020) | Dragon Range (Zen 4) (2023) |
| PassMark | 32,512 | 32,515 |
| Cinebench R23 Multi | 18,400 | 18,606+1% |
| Geekbench 6 Single | 1,750 | 2,623+50% |
| Geekbench 6 Multi | 10,500 | 14,000+33% |
Memory & Platform
The Ryzen 9 3900XT uses the AM4 socket (PCIe 4.0), while the Ryzen 7 7745HX 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 7745HX — the Ryzen 7 7745HX 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 7745HX) — the Ryzen 7 7745HX offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: X570,B550,X470,B450 (Ryzen 9 3900XT) and FL1 (Ryzen 7 7745HX).
| Feature | Ryzen 9 3900XT | Ryzen 7 7745HX |
|---|---|---|
| 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 7745HX supports AVX-512 instructions — important for machine learning and scientific applications. Both support AMD-V virtualization. The Ryzen 7 7745HX 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 7745HX targets Performance Gaming Laptop. Direct competitor: Ryzen 9 3900XT rivals Core i9-10900K; Ryzen 7 7745HX rivals Core i7-13700HX.
| Feature | Ryzen 9 3900XT | Ryzen 7 7745HX |
|---|---|---|
| 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 | Performance Gaming Laptop |
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