Compatibility check
Can you run Llama 3.1 70B Instruct on the RTX A6000?
Yes, with quantization. Llama 3.1 70B Instruct does not fit the RTX A6000 (48 GB) in FP16, but it runs at INT4 (4-bit) using about 41.9 GB (87% of VRAM). Use a GPTQ, AWQ, or GGUF build to get there, and keep prompts moderate to leave room for the KV cache.
Memory breakdown
Weights plus a 1.3 GB KV cache at 4,096tokens, against the card's 48 GB. Verdicts leave ~10% headroom for activations and fragmentation.
| Precision | Weights | KV cache | Total | % of 48 GB | Fit |
|---|---|---|---|---|---|
| FP16 / BF16full quality | 162.4 GB | 1.3 GB | 163.7 GB | 341% | No |
| INT8 (8-bit)near-full quality | 81.2 GB | 1.3 GB | 82.5 GB | 172% | No |
| INT4 (4-bit)GPTQ / AWQ / GGUF Q4 | 40.6 GB | 1.3 GB | 41.9 GB | 87% | Fits |
Planning estimates, not a substitute for profiling. Real usage varies with the inference runtime, batch size, and how much context you actually use — the KV cache grows linearly with prompt length.
GPUs that run Llama 3.1 70B Instruct
Cards where this model fits (at its best precision):
Models that fit the RTX A6000
Other popular models that run on this card:
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Frequently asked questions
Can the RTX A6000 run Llama 3.1 70B Instruct?
Not in FP16, but yes at INT4 (4-bit), where it uses about 41.9 GB versus the card's 48 GB.
How much VRAM does Llama 3.1 70B Instruct need?
Approximately 162.4 GB in FP16, 81.2 GB in INT8, and 40.6 GB in 4-bit for the weights, plus a KV cache of about 1.3 GB at 4,096 tokens.
Does quantization let Llama 3.1 70B Instruct fit on the RTX A6000?
Yes. Dropping to INT4 (4-bit) brings total usage to about 41.9 GB, which fits the 48 GB card with headroom for the KV cache.
What happens to memory with longer context?
The KV cache grows linearly with prompt length. At 4,096 tokens it is about 1.3 GB here; doubling the context roughly doubles that term, so long-context use can push a tight fit over the edge.