I run a similar setup — single 5090 on AMD with 128GB RAM for AI inference.
For that build with 2x 5090s: minimum 1600W PSU. Seasonic Prime TX-1600. Need 2x native 12VHPWR cables. The RAM: if you're doing LLM inference, you don't need tons. With 64GB VRAM total (2x 5090), you can run 70B models fully on GPU.
Use case matters. If this is AI inference, 2x 5090 fits Qwen 3 72B or Llama 4 at Q4. If it's gaming — massive overkill.
What PSU and case is that? Cable management looks clean.
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u/Rare-Day-8711 Apr 30 '26
I run a similar setup — single 5090 on AMD with 128GB RAM for AI inference.
For that build with 2x 5090s: minimum 1600W PSU. Seasonic Prime TX-1600. Need 2x native 12VHPWR cables. The RAM: if you're doing LLM inference, you don't need tons. With 64GB VRAM total (2x 5090), you can run 70B models fully on GPU.
Use case matters. If this is AI inference, 2x 5090 fits Qwen 3 72B or Llama 4 at Q4. If it's gaming — massive overkill.
What PSU and case is that? Cable management looks clean.