Qwen3 27B quantization tests on 16-20GB VRAM: GSQ-RCO wins overall
Mordimer86 · reddit · 2026-09-20
A Reddit user benchmarked multiple quantized Qwen 27B variants (mainly IQ4XS) on 16-20GB VRAM across three tests. On a hard Three.js animation task, GSQ-RCO IQ3S and Byteshape performed best; Cold Fusion and Nex N2 Mini failed outright. On a long Tauri+Yew rich-text editor task, Unsloth was most reliable (1h) and Twin Turbo fastest (15min with minor bugs), while Nex N2 Mini is not recommended. Surprisingly, Unsloth looped on a '20 three-letter Polish words' test while Byteshape, Swift, and GSQ-RCO passed quickly. Verdict: GSQ-RCO is the pick for 16GB cards (Byteshape close behind); Swift needs a 24GB card in Q4KM due to memory footprint.
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