Intel Arc Pro B70 GPU Cluster LLM Inference Practice: vLLM Tensor Parallel Configuration and Performance Tuning

This article shares an automated LLM inference server deployment solution based on Intel Arc Pro B70 professional GPUs, achieving multi-card collaboration via vLLM tensor parallelism. The core performance is 140 tok/s for dual cards and 540 tok/s for four cards. The solution aims to lower deployment barriers and provide enterprises with a cost-effective inference hardware alternative to NVIDIA.

With the widespread application of LLMs, the choice of inference hardware has become diversified. NVIDIA has long dominated the market, but the Intel Arc series, with its cost-effectiveness and robust software ecosystem, is gradually becoming a viable alternative. As a professional-grade product, Arc Pro B70 is equipped with large-capacity memory and optimized AI acceleration units, making it suitable for edge inference and enterprise-level deployment scenarios.

This project provides automated configuration scripts for B70 clusters, with core highlights including one-click environment setup, multi-card tensor parallelism support, performance benchmarking, and production-level optimization templates. Technically, vLLM's PagedAttention improves memory utilization, and tensor parallelism splits model layers across multiple GPUs for execution. Through adaptation to the Intel XPU backend, it automatically completes driver installation, PyTorch environment configuration, vLLM compilation, and multi-card communication verification.

The benchmark test results are as follows:

Configuration	Throughput (tokens/s)	Application Scenarios
2x B70	140	Small-to-medium models, cost-sensitive scenarios
4x B70	540	Large model inference, high concurrency requirements
The four-card configuration achieves superlinear growth (instead of the theoretical 280 tok/s), which is due to larger batch processing capacity and efficient memory management.

Hardware Requirements: Servers need to support multiple PCIe 4.0 x16 slots, sufficient power supply (1000W+ recommended for four cards), and good heat dissipation. Software Dependencies: Intel GPU driver ≥31.0.101, PyTorch ≥2.1 (with XPU support), vLLM requires Intel's official fork or community-adapted version. Common Pitfalls: PCIe topology must be direct connection/Switch, multi-socket servers need NUMA binding, reserve 10-15% memory to avoid OOM.

The solution is suitable for: Enterprise internal LLM services (data privatization), edge inference nodes (factory/retail localization), cost-sensitive projects (price advantage over NVIDIA A10/A30), and development/test environments (low-cost model validation).

The combination of Intel Arc Pro B70 and vLLM demonstrates the progress of the open-source ecosystem in supporting hardware diversity. The four-card 540 tok/s meets most production throughput requirements, and the automated scripts lower the deployment barrier. In the future, as Intel continues to optimize oneAPI and XPU backend, and the vLLM community improves support, performance and compatibility will be further enhanced. Teams evaluating LLM inference solutions are advised to consider Arc Pro B70.