Altrix CX-3999 Ultra 20-Core LGA1851 Desktop Processor
Processors · Altrix · SKU CX3999-ULTRA · Released 2025 · Updated 2026-10-23
Key facts
| Benchmark index | 31,633 (Processors scale) |
|---|---|
| Category rank | #10,142 |
| Street price | $249 |
| Power | 125 W (TDP) |
| Performance per dollar | 127.04 |
| Released | 2025 |
Specifications
| Brand | Altrix |
|---|---|
| Model | Altrix CX-3999 Ultra |
| Socket | LGA1851 |
| Cores / threads | 20 cores (8P + 12E) / 20 threads |
| Base clock | 3.3 GHz |
| Max boost clock | 5.1 GHz |
| L3 cache | 30 MB |
| Power | 125 W base / 250 W max turbo |
| Memory support | DDR5-6400, dual channel (CUDIMM supported) |
| CPU PCIe lanes | 20× PCIe 5.0 + 4× PCIe 4.0 |
| Integrated graphics | Integrated graphics (4 cores) |
| Unlocked multiplier | No |
| NPU | 13 TOPS |
| Cooler included | No |
Related guides
Intel LGA1851 SocketCPU TDP, PPT and Turbo Power ExplainedPCIe Lanes ExplainedDDR5 Memory ExplainedPCIe 5.0 ExplainedIntel 800 Series Chipsets
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| Nexora CX-8608 Ti 8-Core AM5 Desktop Processor | 40,680 | $389 | Compare |
| Altrix CX-9400 Max 8-Core AM4 Desktop Processor | 38,123 | $389 | Compare |
| Nexora CX-2802 Prime 14-Core LGA1700 Desktop Processor | 22,849 | $109 | Compare |
| Nexora CX-5366 Prime 16-Core AM4 Desktop Processor | 59,600 | $869 | Compare |
| Nexora CX-5845 Core 14-Core LGA1851 Desktop Processor | 20,549 | $99 | Compare |
| Nexora CX-7457 XT 8-Core AM4 Desktop Processor | 29,155 | $219 | Compare |
Cite this page: Hardware Spec Index, “Altrix CX-3999 Ultra 20-Core LGA1851 Desktop Processor”, https://vextor7.com/item/91491656 (accessed 2026-10-23).