Llama 3.1 405B vs Llama 3 1 Nemotron Ultra 253B V1
Side-by-side comparison of VRAM requirements, quantization, context length, and hardware compatibility.
Specifications
| Llama 3.1 405B | Llama 3 1 Nemotron Ultra 253B V1 | |
|---|---|---|
| Parameters | 405B | 253.4B |
| Context | — | 131K |
| Architecture | — | DeciLMForCausalLM |
| License | Llama 3.1 Community | Other |
| Downloads | 514.6K | 5.0K |
| Released | Sep 2024 | Oct 2025 |
VRAM by Quantization: Llama 3.1 405B vs Llama 3 1 Nemotron Ultra 253B V1
| Quantization | Bits | Llama 3.1 405B VRAM | Llama 3 1 Nemotron Ultra 253B V1 VRAM |
|---|---|---|---|
| BF16 | 16.00 | 891 GB | 557.5 GB |
Verdict
Llama 3 1 Nemotron Ultra 253B V1 needs less VRAM at BF16 (557.5 GB vs 891.0 GB), so it fits on smaller GPUs. Llama 3.1 405B is the more widely downloaded of the two.
Frequently Asked Questions
- Which needs less VRAM, Llama 3.1 405B or Llama 3 1 Nemotron Ultra 253B V1?
At BF16, Llama 3.1 405B needs 891.0 GB and Llama 3 1 Nemotron Ultra 253B V1 needs 557.5 GB, so Llama 3 1 Nemotron Ultra 253B V1 is the lighter option to run locally.
- What is the difference between Llama 3.1 405B and Llama 3 1 Nemotron Ultra 253B V1?
Llama 3.1 405B is a 405B model from Meta (Llama 3 family), while Llama 3 1 Nemotron Ultra 253B V1 is a 253.4B model from NVIDIA (Llama 3 family). Compare their VRAM requirements above to see which fits your GPU or Mac.