AMD Ryzen 5 8400F vs AMD Ryzen 9 3900X
70.7Single-core37.6
49.5Multi-core54.2
45.5Gamingspec-based78.3
9 spec wins — AMD Ryzen 5 8400F7 spec wins — AMD Ryzen 9 3900X
InnoReviews verdict
This one is close to a dead heat: AMD Ryzen 5 8400F scores 54.9 against 55.2 for AMD Ryzen 9 3900X. Pick by the categories that matter to you — AMD Ryzen 9 3900X edges ahead in multi-core, or by price.
Which would you pick?
Key differences
Reasons to pick the AMD Ryzen 5 8400F
- Stronger single-core score: 71 vs 38
- 100% higher Max memory: 256 GB vs 128 GB
- 70% higher Geekbench 6 (single): 2,617 vs 1,540
- 43% lower process: 4 nm vs 7 nm
- 38% lower Base TDP: 65 W vs 105 W
- Lower launch price: $170 vs $499
Reasons to pick the AMD Ryzen 9 3900X
- Stronger multi-core score: 54 vs 50
- 300% higher L3 cache: 64 MB vs 16 MB
- 100% higher cores: 12 vs 6
- 100% higher Performance cores: 12 vs 6
- 100% higher threads: 24 vs 12
General
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900X |
|---|---|---|
| Announced | 2024 | 2019 |
| Socket | AM5 | AM4 |
| Process | 4 nm+43% | 7 nm |
| Base TDP | 65 W+38% | 105 W |
| Max turbo power | 88 W | 142 W+61% |
| Unlocked multiplier | Yes | Yes |
| Cooler included | Yes | Yes |
Cores & Clocks
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900X |
|---|---|---|
| Cores | 6 | 12+100% |
| Performance cores | 6 | 12+100% |
| Efficiency cores | 0 | 0 |
| Threads | 12 | 24+100% |
| Base clock | 4.2 GHz+11% | 3.8 GHz |
| Boost clock | 4.7 GHz+2% | 4.6 GHz |
| L2 cache | 6 MB | 6 MB |
| L3 cache | 16 MB | 64 MB+300% |
Memory
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900X |
|---|---|---|
| Memory support | DDR5-5200 | DDR4-3200 |
| Max memory | 256 GB+100% | 128 GB |
| Memory channels | 2 | 2 |
Platform
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900X |
|---|---|---|
| PCIe version | 4 | 4 |
| CPU PCIe lanes | 20 | 24+20% |
Benchmarks
| Spec | AMD Ryzen 5 8400F | AMD Ryzen 9 3900X |
|---|---|---|
| Geekbench 6 (single) | 2,617+70%Top 36% | 1,540Bottom 32% |
| Geekbench 6 (multi) | 11,857+8%Top 44% | 11,000Top 48% |
| Cinebench R23 (single) | — | 1,300Bottom 32% |
| Cinebench R23 (multi) | — | 18,300Top 33% |
| PassMark | 24,372Bottom 47% | 32,465+33%Top 36% |
| PassMark (single thread) | 3,684+36%Top 48% | 2,702Bottom 27% |
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