AIINFERENCE

High-Concurrency LLM Serving Architecture: Maximizing Tokens-per-Second with vLLM Chunked Prefill & FP4 Tensor Engine

Serving 70B to 405B foundation models with continuous batching, RadixAttention prefix caching, and native FP8/FP4 quantization on NVIDIA Hopper and Blackwell.

Julian Mercer
Julian Mercer
Principal Systems Architect, NovaPod
October 19, 2026
·
9 min read
Recommended Hardware:NVIDIA H200 SXM5 / B200 SXM
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NovaPod AI Cloud EngineeringINFERENCE
High-Concurrency LLM Serving Architecture: Maximizing Tokens-per-Second with vLLM Chunked Prefill & FP4 Tensor Engine
novapod.io
70B First-Token Latency34 ms TTFT
H200 Decode Throughput2,650 tok/s
Memory Footprint Reduction52% via FP8

Scaling production LLM APIs from a proof-of-concept to serving thousands of concurrent requests reveals immediate throughput ceilings: static batching starves GPU compute cores, while unmanaged KV caches cause out-of-memory crashes.

On NovaPod, our production inference templates combine continuous batching, chunked prefill, and PagedAttention to eliminate memory fragmentation entirely, delivering up to 4x higher token throughput compared to naive model servers.

On NVIDIA H200 SXM5 instances (141 GB HBM3e at 4.8 TB/s bandwidth), a single GPU can comfortably serve Llama 3 70B in FP8 precision while retaining sufficient memory headroom for 128k active context tokens.

Furthermore, all NovaPod serving nodes expose standard OpenAI-compatible endpoints with Server-Sent Events (SSE) streaming, making them instantaneous drop-in replacements for downstream applications.

NovaPod CLI Quick Launch
python3 -m vllm.entrypoints.openai.api_server \
  --model meta-llama/Meta-Llama-3-70B-Instruct \
  --tensor-parallel-size 4 \
  --gpu-memory-utilization 0.95 \
  --enable-chunked-prefill \
  --port 8000
Key Architecture TakeawayInference economics are dictated by memory bandwidth (HBM3e) and continuous batching efficiency. On NovaPod, pre-tuned vLLM and SGLang templates provide instant drop-in OpenAI compatible streaming endpoints with full hardware acceleration.

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