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AMD Ryzen 9 5900 vs AMD Ryzen 9 9900X: Comparison
AMD Ryzen 9 5900 and AMD Ryzen 9 9900X separate most on l2 cache: AMD Ryzen 9 5900 at 6 MB, AMD Ryzen 9 9900X at 12 MB, 50% in favour of AMD Ryzen 9 9900X. PCIe Lanes splits them by another 17%, again favouring AMD Ryzen 9 9900X. They match on 7 other specifications, including market segment, performance cores and efficiency cores.
Specs
| Specification |  |  |
|---|---|---|
| Form Factor | Desktops | Desktop |
| Model Number | 5900 | 9900X |
| Codename | Vermeer | Granite Ridge |
| TDP | 65 W | 120 W |
| iGPU | Discrete Graphics Card Required | AMD Radeon Graphics (2 cores) |
| Market Segment | Desktop | Desktop |
| Socket | AM4 | AM5 |
| Socket Status | End of Life | Current |
| Process Node | 7 nm | 4 nm |
| Performance Cores | 12 | 12 |
| Efficiency Cores | 0 | 0 |
| SMT Enabled | Yes | true |
| P-Core Base Clock | 3.0 | 4.4 |
| P-Core Boost Clock | 4.7 | 5.6 |
| Unlocked Multiplier | Yes | true |
| L2 Cache | 6 MB-50% | 12 MB |
| L3 Cache | 64 MB | 64 MB |
| Base Power | 65 W | 120 W |
| Max Turbo Power | 88 | 162 |
| Memory Type | DDR4 | DDR5 |
| Max Memory Speed | 3200 | 5600 |
| Memory Channels | 2 | 2 |
| ECC Support | No | true |
| Integrated Graphics | No | Yes |
| PCIe Generation | PCIe 4.0 | PCIe 5.0 |
| PCIe Lanes | 20-17% | 24 |
| Retail Availability | OEM Only | Boxed Retail |
| Cores | 12 | 12 |
| Threads | 24 | 24 |
| Memory Support | DDR4, Up to 3200 MT/s | DDR5-5600 |