AMD Ryzen 9 3900X vs AMD Ryzen 9 7900
37.6Single-core78.6
54.2Multi-core70.5
78.3Gamingspec-based83.3
2 spec wins — AMD Ryzen 9 3900X12 spec wins — AMD Ryzen 9 7900
InnoReviews verdict
AMD Ryzen 9 7900 wins this desktop processor face-off, 76.1 to 55.3, pulling ahead mainly in single-core (+41) and multi-core (+16). AMD Ryzen 9 3900X still makes sense if its price or standout specs fit your needs better.
Which would you pick?
Key differences
Reasons to pick the AMD Ryzen 9 3900X
- Has Cooler included — the other doesn't
Reasons to pick the AMD Ryzen 9 7900
- Stronger single-core score: 79 vs 38
- Stronger multi-core score: 71 vs 54
- 100% higher L2 cache: 12 MB vs 6 MB
- 94% higher Geekbench 6 (single): 2,990 vs 1,540
- 51% higher Cinebench R23 (single): 1,966 vs 1,300
- Lower launch price: $429 vs $499
General
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 7900 |
|---|---|---|
| Announced | 2019 | 2023 |
| Socket | AM4 | AM5 |
| Process | 7 nm | 5 nm+29% |
| Base TDP | 105 W | 65 W+38% |
| Max turbo power | 142 W | — |
| Unlocked multiplier | Yes | Yes |
| Cooler included | Yes | No |
Cores & Clocks
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 7900 |
|---|---|---|
| Cores | 12 | 12 |
| Performance cores | 12 | 12 |
| Efficiency cores | 0 | 0 |
| Threads | 24 | 24 |
| Base clock | 3.8 GHz+3% | 3.7 GHz |
| Boost clock | 4.6 GHz | 5.4 GHz+17% |
| L2 cache | 6 MB | 12 MB+100% |
| L3 cache | 64 MB | 64 MB |
Integrated GPU
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 7900 |
|---|---|---|
| iGPU | — | AMD Radeon Graphics |
| iGPU clock | — | 2,200 MHz |
Memory
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 7900 |
|---|---|---|
| Memory support | DDR4-3200 | DDR5-5200 |
| Max memory | 128 GB | 128 GB |
| Memory channels | 2 | 2 |
Platform
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 7900 |
|---|---|---|
| PCIe version | 4 | 5+25% |
| CPU PCIe lanes | 24 | 28+17% |
Benchmarks
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 7900 |
|---|---|---|
| Geekbench 6 (single) | 1,540Bottom 33% | 2,990+94%Top 19% |
| Geekbench 6 (multi) | 11,000Top 46% | 15,725+43%Top 28% |
| Cinebench R23 (single) | 1,300Bottom 34% | 1,966+51%Top 26% |
| Cinebench R23 (multi) | 18,300Top 31% | 24,776+35%Top 21% |
| PassMark | 32,600Top 37% | 48,013+47%Top 20% |
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