RTX 5090 dominates single-GPU performance but hits memory walls, while dual AMD R9700 setups scale better for massive language models in llama.cpp benchmark tests.

RTX 5090 achieves exceptional speeds (5,988 t/s prompt processing, 205 t/s generation) on Qwen 3.5 35B MoE but cannot load 72B and 122B models due to 32GB VRAM limitation

Dual AMD R9700 setup (60GB total VRAM) successfully runs 70B models, achieving 11.49 t/s generation speed and scaling beyond single-GPU constraints

Benchmark tested dense models (32B, 70B) and mixture-of-experts models (35B, 122B) from Qwen family using latest llama-bench build 8463

Enterprise DGX Spark (GB10) and AMD AI395 (Strix Halo) with unified memory tested as alternatives to consumer-grade RTX 5090 for local AI inference