AMD Ryzen 5 8400F vs AMD Ryzen 9 3900
70.7Single-core43.1
49.5Multi-core50.6
45.5Gamingspec-based76.5
7 spec wins — AMD Ryzen 5 8400F4 spec wins — AMD Ryzen 9 3900
InnoReviews verdict
This one is close to a dead heat: AMD Ryzen 5 8400F scores 54.9 against 54.8 for AMD Ryzen 9 3900. Pick by the categories that matter to you — AMD Ryzen 5 8400F edges ahead in single-core, or by price.
Which would you pick?
Key differences
Reasons to pick the AMD Ryzen 5 8400F
- Stronger single-core score: 71 vs 43
- 51% higher Geekbench 6 (single): 2,617 vs 1,735
- 43% lower process: 4 nm vs 7 nm
- 41% higher PassMark (single thread): 3,684 vs 2,605
- 35% higher Base clock: 4.2 GHz vs 3.1 GHz
Reasons to pick the AMD Ryzen 9 3900
- 300% higher L3 cache: 64 MB vs 16 MB
- 100% higher cores: 12 vs 6
- 100% higher threads: 24 vs 12
- 25% higher PassMark: 30,545 vs 24,372
General
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900 |
|---|---|---|
| Announced | 2024 | 2019 |
| Socket | AM5 | AM4 |
| Process | 4 nm+43% | 7 nm |
| Base TDP | 65 W | 65 W |
| Max turbo power | 88 W | — |
| Unlocked multiplier | Yes | Yes |
| Cooler included | Yes | — |
Cores & Clocks
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900 |
|---|---|---|
| Cores | 6 | 12+100% |
| Performance cores | 6 | — |
| Efficiency cores | 0 | — |
| Threads | 12 | 24+100% |
| Base clock | 4.2 GHz+35% | 3.1 GHz |
| Boost clock | 4.7 GHz+9% | 4.3 GHz |
| L2 cache | 6 MB | 6 MB |
| L3 cache | 16 MB | 64 MB+300% |
Memory
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900 |
|---|---|---|
| Memory support | DDR5-5200 | DDR4-3200 |
| Max memory | 256 GB | — |
| Memory channels | 2 | 2 |
Platform
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900 |
|---|---|---|
| PCIe version | 4 | 4 |
| CPU PCIe lanes | 20 | — |
Benchmarks
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900 |
|---|---|---|
| Geekbench 6 (single) | 2,617+51%Top 35% | 1,735Bottom 43% |
| Geekbench 6 (multi) | 11,857+25%Top 43% | 9,504Bottom 50% |
| PassMark | 24,372Top 46% | 30,545+25%Top 35% |
| PassMark (single thread) | 3,684+41%Top 40% | 2,605Bottom 24% |
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