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Dual GPUs Hack for 16GB VRAM Users

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🦙Read original on Reddit r/LocalLLaMA
#multi-gpu#local-llm#vr-am-hackllama-serverllama-servervulkanqwen3.6-27b

💡Cheap VRAM hack runs 30B models at 19t/s on mixed GPUs

⚡ 30-Second TL;DR

What Changed

Combine 16GB + 6GB GPUs via Vulkan devices

Why It Matters

Config tweaks like split-mode=layer and no-mmap minimize RAM use.

What To Do Next

Run `llama-server --list-devices` to identify Vulkan IDs and test dual-GPU config.

Who should care:Developers & AI Engineers

Key Points

  • Combine 16GB + 6GB GPUs via Vulkan devices
  • Config: n-gpu-layers=999, split-mode=layer, np=1
  • 22GB total VRAM runs 27B Q4_K_M model
  • 19.21 t/s eval, 186 t/s prompt at 128k context
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Original source: Reddit r/LocalLLaMA

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