Exact VRAM memory allocation, dynamic KV-cache requirements, and tensor parallelism slicing for InternLM2.5 20B 1M Context quantized in FP8 Scaled Native Hopper deployed on NVIDIA B200 192GB Blackwell.
Uncompressed weights alone consume 20.0 GB. In addition, the KV cache scales with context tokens and concurrency batch size, plus ~1.8 GB CUDA driver overhead.
If total weights + KV cache exceeds the 192 GB boundary, Tensor Parallelism (TP) or vLLM PagedAttention multi-GPU sharding across NVLink is required.
Modern AWQ and GPTQ retain >98% perplexity compared to FP16 while halving memory footprint and doubling memory-bandwidth-bound token generation speed.