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ENGINEERING COMPUTATIONAL TOOL #20
Llama-3.1 405B Ultra-Scale (GPTQ 4-Bit Second-Order) on NVIDIA L40S 48GB Ada Lovelace VRAM & Throughput Calculator
Exact VRAM memory allocation, dynamic KV-cache requirements, and tensor parallelism slicing for Llama-3.1 405B Ultra-Scale quantized in GPTQ 4-Bit Second-Order deployed on NVIDIA L40S 48GB Ada Lovelace.
Hardware & Deployment Parameters
Billion Params
Tokens
Concurrency
GB
Initializing Scientific Computational Engine...
Engineering Implementation Guidelines
1
Set model parameter size (405B) and verify GPTQ 4-Bit Second-Order quantization precision.
2
Define production context length in tokens and peak concurrent query concurrency.
3
Evaluate required memory capacity and calculate multi-GPU tensor parallelism scaling across NVIDIA L40S 48GB Ada Lovelace nodes.
Frequently Asked Engineering Questions (FAQ)
How much VRAM does Llama-3.1 405B Ultra-Scale require in GPTQ 4-Bit Second-Order?
Uncompressed weights alone consume 202.5 GB. In addition, the KV cache scales with context tokens and concurrency batch size, plus ~1.8 GB CUDA driver overhead.
Can a single NVIDIA L40S 48GB Ada Lovelace run this model without Out-Of-Memory (OOM)?
If total weights + KV cache exceeds the 48 GB boundary, Tensor Parallelism (TP) or vLLM PagedAttention multi-GPU sharding across NVLink is required.
How does 4-bit quantization affect inference quality and speed?
Modern AWQ and GPTQ retain >98% perplexity compared to FP16 while halving memory footprint and doubling memory-bandwidth-bound token generation speed.