DeepSeek-V3.2 vs Llama-3.1-405B
DeepSeek-V3.2 (685.4B parameters) and Llama-3.1-405B (405.9B parameters) side by side: the memory each needs at every precision, what it costs to run on a live GPU, and the context window, KV cache and license where they are published. Numbers are computed from the models' published specs; this page does not rank quality.
Side by side
| Fact | DeepSeek-V3.2 | Llama-3.1-405B |
|---|---|---|
| Parameters | 685.4B | 405.9B |
| Architecture | Multi-head latent attention; mixture of 256 experts, 8 active per token | – |
| Context length | 163,840 tokens | – |
| License | – | – |
| Published precision | F8_E4M3 | BF16 |
| VRAM needed, As published | 766 GB | 907 GB |
| VRAM needed, FP8 | Not a smaller option | 454 GB |
| VRAM needed, INT4 | 383 GB | 227 GB |
| Cheapest live fit, As published | RTX PRO 6000 WS × 8 · $11.75/hr | No live fit |
| Cheapest live fit, FP8 | – | RTX PRO 6000 × 5 · $6.88/hr |
| Cheapest live fit, INT4 | RTX A6000 × 8 · $2.90/hr | RTX A6000 × 5 · $1.81/hr |
| KV cache per token (16-bit) | 69 KB | Not published for this architecture |
| KV cache at 32k tokens | 2.14 GB | Not published for this architecture |
| KV cache at 128k tokens | 8.58 GB | Not published for this architecture |
VRAM is the weight size at each precision times a flat 1.2 overhead; see the methodology. The FP8 and INT4 rows need a quantized checkpoint or an engine that quantizes on load. The fit is the lowest-priced single GPU type that holds the model at that precision, or the lowest-priced multi-GPU set (up to 8) when none does. KV cache is for one sequence at 16-bit, computed from each model's config where the attention layout is known.
Which to pick
- DeepSeek-V3.2 needs less VRAM at its published precision (766 GB against 907 GB), so it fits on a smaller GPU.
These follow only from the facts in the table above. Whether either model does your task well is a separate question this page does not answer.
Keep reading
- DeepSeek-V3.2: full VRAM table and live GPU fit
- Llama-3.1-405B: full VRAM table and live GPU fit
- The DeepSeek model series
- The Llama model series
Other comparisons
