RX 6800 gets 3x faster ComfyUI images by re-enabling silently disabled INT8
TheCat001 · reddit · 2026-11-11
A Reddit user details how to get 3x faster image generation in ComfyUI on an RX 6800 (RDNA2) using a custom branch plus wheel from KornienkoDev. Qwen Image 2.1 (int8 convrot, 1024x1024): base 25 steps dropped from 180s to 60s, turbo 8 steps from 70s to 20s.
Why it works:
- ComfyUI asks the GPU about INT8 support, gets "no" on RDNA2, and silently uses a slower path — the cards can actually do it
- Attention was needlessly shuffling data every block; now fixed
- The shipped INT8 matmul targeted cards with AI hardware; a new kernel runs on regular shader cores
Setup: clone the rdna2-all ComfyUI branch, force-reinstall the comfy-kitchen wheel (gfx1030-1032: 6800/6800 XT/6900/6700/6600), and launch with --disable-mmap --disable-pinned-memory --highvram. A way to keep RDNA2 cards alive without buying new NVIDIA hardware.
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