Altrix CX-3991 Prime 20-Core LGA1851 Desktop Processor
Processors · Altrix · SKU CX3991-PRIME · Released 2025 · Updated 2026-10-19
Key facts
| Benchmark index | 50,593 (Processors scale) |
|---|---|
| Category rank | #40,565 |
| Street price | $569 |
| Power | 125 W (TDP) |
| Performance per dollar | 88.92 |
| Released | 2025 |
Specifications
| Brand | Altrix |
|---|---|
| Model | Altrix CX-3991 Prime |
| Socket | LGA1851 |
| Cores / threads | 20 cores (8P + 12E) / 20 threads |
| Base clock | 2.7 GHz |
| Max boost clock | 5.4 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 | None (F model) |
| 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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| Altrix CX-6901 Edge 6-Core AM4 Desktop Processor | 17,885 | $109 | Compare |
| Veltrix CX-3721 Core 8-Core AM5 Desktop Processor | 42,239 | $469 | Compare |
| Veltrix CX-5546 Prime 12-Core AM4 Desktop Processor | 35,010 | $279 | Compare |
| Veltrix CX-7416 Max 6-Core AM5 Desktop Processor | 18,662 | $89 | Compare |
| Veltrix CX-5542 Ultra 20-Core LGA1851 Desktop Processor | 50,907 | $739 | Compare |
| Veltrix CX-6451 Edge 12-Core AM5 Desktop Processor | 50,466 | $599 | Compare |
Cite this page: Hardware Spec Index, “Altrix CX-3991 Prime 20-Core LGA1851 Desktop Processor”, https://vextor7.com/item/24422 (accessed 2026-10-19).