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Old Guard’s Revenge: AMD MI50 Hits 52.8 TPS on Qwen 27B Without Quantization

TIMESTAMP // May.14
#AMD MI50 #Compute ROI #LLM Inference #Qwen #ROCm

Event Core Recent benchmarks shared in the LocalLLaMA community highlight the surprising longevity of the AMD MI50 (circa 2018). Running a Qwen 27B model at full precision (no quantization) and without Multi-Token Prediction (MTP), the hardware achieved a staggering 52.8 tps in token generation and 1569 tps in prompt processing under a TP8 configuration. Even scaled down to TP2, the setup maintained a robust 34 tps. ▶ Legacy Hardware Longevity: The MI50’s HBM2 memory architecture continues to provide a competitive edge in memory-bound LLM inference tasks, outperforming many modern consumer-grade GPUs in raw throughput for mid-sized models. ▶ High-Fidelity Inference: Achieving high TPS without quantization suggests that ROCm-based stacks have matured significantly, allowing for high-performance, full-precision deployments on aging enterprise silicon. Bagua Insight This performance profile signals a "second life" for legacy enterprise accelerators in the GenAI era. The MI50 is effectively becoming the "GTX 1080 Ti" of AI—a piece of hardware that refuses to become obsolete. For models in the 20B-30B parameter range, like Qwen 27B, the bottleneck is almost always memory bandwidth rather than compute TFLOPS. By leveraging Tensor Parallelism (TP) across multiple cheap, refurbished MI50s, developers can bypass the "VRAM tax" imposed by NVIDIA's consumer line. This trend underscores a shift where software optimization and interconnect efficiency are bridging the gap between legacy enterprise gear and cutting-edge consumer silicon. Actionable Advice Small-to-medium enterprises and home lab enthusiasts should evaluate refurbished AMD Instinct cards (MI50/MI60) as a cost-effective alternative for internal RAG pipelines and dev environments. When deploying, prioritize Tensor Parallelism over aggressive quantization to maintain model reasoning integrity, especially when the hardware’s aggregate memory bandwidth can support full-precision weights at acceptable latencies.

SOURCE: REDDIT LOCALLLAMA // UPLINK_STABLE