AMD Ryzen 9 3900X vs AMD Ryzen 9 9900X3D
37.6Single-core—
54.2Multi-core86.2
78.3Gamingspec-based93.8
2 spec wins — AMD Ryzen 9 3900X10 spec wins — AMD Ryzen 9 9900X3D
InnoReviews verdict
No overall winner yet: AMD Ryzen 9 9900X3D lacks the published benchmark results an Inno Score requires, so there is no Inno Score to compare — we don't rank chips on their spec sheet alone. The spec table below still shows every difference we track.
Which would you pick?
Key differences
Reasons to pick the AMD Ryzen 9 3900X
- 12% lower Base TDP: 105 W vs 120 W
- Has Cooler included — the other doesn't
- Lower launch price: $499 vs $599
Reasons to pick the AMD Ryzen 9 9900X3D
- Stronger multi-core score: 86 vs 54
- 100% higher L2 cache: 12 MB vs 6 MB
- 100% higher L3 cache: 128 MB vs 64 MB
- 100% higher Max memory: 256 GB vs 128 GB
- 72% higher PassMark: 56,050 vs 32,600
General
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 9900X3D |
|---|---|---|
| Announced | 2019 | 2025 |
| Socket | AM4 | AM5 |
| Process | 7 nm | 4 nm+43% |
| Base TDP | 105 W+12% | 120 W |
| Max turbo power | 142 W | — |
| Unlocked multiplier | Yes | Yes |
| Cooler included | Yes | No |
Cores & Clocks
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 9900X3D |
|---|---|---|
| Cores | 12 | 12 |
| Performance cores | 12 | 12 |
| Efficiency cores | 0 | 0 |
| Threads | 24 | 24 |
| Base clock | 3.8 GHz | 4.4 GHz+16% |
| Boost clock | 4.6 GHz | 5.5 GHz+20% |
| L2 cache | 6 MB | 12 MB+100% |
| L3 cache | 64 MB | 128 MB+100% |
Integrated GPU
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 9900X3D |
|---|---|---|
| iGPU | — | AMD Radeon Graphics (2 CU RDNA 2) |
| iGPU clock | — | 2,200 MHz |
Memory
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 9900X3D |
|---|---|---|
| Memory support | DDR4-3200 | DDR5-5600 |
| Max memory | 128 GB | 256 GB+100% |
| Memory channels | 2 | 2 |
Platform
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 9900X3D |
|---|---|---|
| PCIe version | 4 | 5+25% |
| CPU PCIe lanes | 24 | 28+17% |
Benchmarks
| Spec | AMD Ryzen 9 3900X | AMD Ryzen 9 9900X3D |
|---|---|---|
| Geekbench 6 (single) | 1,540Bottom 33% | — |
| Geekbench 6 (multi) | 11,000Top 46% | — |
| Cinebench R23 (single) | 1,300Bottom 34% | — |
| Cinebench R23 (multi) | 18,300Top 31% | — |
| PassMark | 32,600Top 37% | 56,050+72%Top 12% |
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