Ryzen 7 3800X vs Ryzen 7 7840S
Ryzen 7 3800X
Ryzen 7 7840S
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 7 3800X
Performance Per Dollar Ryzen 7 7840S
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Ryzen 7 3800X | Ryzen 7 7840S |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($140) | ✅ More affordable ($0) |
| Longevity | ✨ Modern (Matisse (2019−2020) / 7 nm, 12 nm) | ✨ Modern (Phoenix-HS (Zen 4) (2023) / 4 nm) |
💎 Value Proposition
| Insight | Ryzen 7 3800X | Ryzen 7 7840S |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($140) | ✅ 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 7 3800X and Ryzen 7 7840S
Ryzen 7 3800X
The Ryzen 7 3800X is manufactured by AMD. It was released in 7 July 2019 (6 years ago). It is based on the Matisse (2019−2020) architecture. It features 8 cores and 16 threads. Base frequency is 3.9 GHz, with boost up to 4.5 GHz. L3 cache: 32 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 Dual-channel. Passmark benchmark score: 23,008 points. Launch price was $399.
Ryzen 7 7840S
The Ryzen 7 7840S is manufactured by AMD. It was released in 5 January 2023 (2 years ago). It is based on the Phoenix-HS (Zen 4) (2023) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 5.1 GHz. L3 cache: 16 MB. L2 cache: 8 MB. Built on 4 nm process technology. Socket: FP7/FP7r2/FP8. Thermal design power (TDP): 8 MB + 16 MB. Memory support: DDR5. Passmark benchmark score: 23,290 points. Launch price was $299.
Processing Power
Both the Ryzen 7 3800X and Ryzen 7 7840S share an identical 8-core/16-thread configuration. Boost clocks reach 4.5 GHz on the Ryzen 7 3800X versus 5.1 GHz on the Ryzen 7 7840S — a 12.5% clock advantage for the Ryzen 7 7840S (base: 3.9 GHz vs 3.8 GHz). The Ryzen 7 3800X uses the Matisse (2019−2020) architecture (7 nm, 12 nm), while the Ryzen 7 7840S uses Phoenix-HS (Zen 4) (2023) (4 nm). In PassMark, the Ryzen 7 3800X scores 23,008 against the Ryzen 7 7840S's 23,290 — a 1.2% lead for the Ryzen 7 7840S. L3 cache: 32 MB on the Ryzen 7 3800X vs 16 MB on the Ryzen 7 7840S.
| Feature | Ryzen 7 3800X | Ryzen 7 7840S |
|---|---|---|
| Cores / Threads | 8 / 16 | 8 / 16 |
| Boost Clock | 4.5 GHz | 5.1 GHz+13% |
| Base Clock | 3.9 GHz+3% | 3.8 GHz |
| L3 Cache | 32 MB+100% | 16 MB |
| L2 Cache | 512K (per core) | 8 MB+1500% |
| Process | 7 nm, 12 nm | 4 nm-43% |
| Architecture | Matisse (2019−2020) | Phoenix-HS (Zen 4) (2023) |
| PassMark | 23,008 | 23,290+1% |
| Cinebench R23 Multi | — | 13,500 |
| Geekbench 6 Single | — | 2,570 |
| Geekbench 6 Multi | — | 13,535 |
Memory & Platform
The Ryzen 7 3800X uses the AM4 socket (PCIe 4.0), while the Ryzen 7 7840S uses FP7/FP7r2/FP8 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the Ryzen 7 3800X versus DDR5-5600, LPDDR5x-7500 on the Ryzen 7 7840S — the Ryzen 7 7840S supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 7 7840S supports up to 256 GB of RAM compared to 128 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 24 (Ryzen 7 3800X) vs 20 (Ryzen 7 7840S) — the Ryzen 7 3800X offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD 500 series,AMD 400 series (Ryzen 7 3800X) and SoC (Ryzen 7 7840S).
| Feature | Ryzen 7 3800X | Ryzen 7 7840S |
|---|---|---|
| Socket | AM4 | FP7/FP7r2/FP8 |
| PCIe Generation | PCIe 4.0 | PCIe 4.0 |
| Max RAM Speed | DDR4-3200 | DDR5-5600, LPDDR5x-7500+25% |
| Max RAM Capacity | 128 GB | 256 GB+100% |
| RAM Channels | 2 | 2 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 24+20% | 20 |
Advanced Features
Only the Ryzen 7 3800X has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Ryzen 7 7840S supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: AMD-V (Ryzen 7 3800X) vs AMD-V (SVM) (Ryzen 7 7840S). The Ryzen 7 7840S includes integrated graphics (Radeon 780M), while the Ryzen 7 3800X requires a dedicated GPU. Primary use case: Ryzen 7 3800X targets Desktop, Ryzen 7 7840S targets Gaming. Direct competitor: Ryzen 7 7840S rivals Core i7-1360P.
| Feature | Ryzen 7 3800X | Ryzen 7 7840S |
|---|---|---|
| Integrated GPU | No | Yes |
| IGPU Model | — | Radeon 780M |
| Unlocked | Yes | No |
| AVX-512 | No | Yes |
| Virtualization | AMD-V | AMD-V (SVM) |
| Target Use | Desktop | Gaming |
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