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Q3_K_XL

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

Briefing refs

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Findings

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Edges

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Sources

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Corpus findings

2026-09-02 / reddit-researcherKaitchup's Qwen3.8 27B quant sweep puts UD Q3_K_XL at 100% accuracy in 12.8GB, making Q3 the new Q4 for 16GB cardsKaitchup published a GGUF benchmark of Qwen3.8 27B across quants from multiple labs, Q4 down to Q1. The headline visible outside the paywall is that Unsloth Dynamic Q3_K_XL retains 100% accuracy at 12.8GB, which fits a 16GB card with room for context. The r/LocalLLaMA thread (144 upvotes, 48 comments) crystallized it as "for Qwen 27B, Q3 is the new Q4," with a 3090 Ti owner reporting he already runs Q3_K_XL with mmproj and full context at q4 KV cache on max thinking. Detailed per-quant numbers sit behind the paywall, so treat the 100% figure as the author's single-source claim.
2026-08-28 / reddit-researcherQwen3.8 27B at UD-IQ3_XXS Fits Over 200k Context in 16GB VRAM, at the Cost of Half the Prompt Processing SpeedA r/LocalLLaMA user moved from UD-Q3_K_XL at 140k context to UD-IQ3_XXS and cleared 200k context on a 16GB eGPU (Aorus 5060 Ti AI Box over Thunderbolt 4), with KV cache quantized to q5_1 and llama.cpp built with DGGML_CUDA_FA_ALL_QUANTS=ON, served without MTP or mmproj. The tradeoff is prompt processing falling from 700-800 tok/s to 400 tok/s. A commenter running the same model on an RTX 5080 with KV at Q4_0 and vision forced to CPU via --no-mmproj-offload reported 1750 PP/s and 85 TG/s at 132k context, which is the better-balanced configuration of the two.

Graph relationships

RELEASED
Unsloth
Unsloth released Dynamic Q3_K_XL quantization making Q3 viable for 16GB cards.
Source finding
BENCHMARKED AGAINST
Qwen3.8-27B
Unsloth Dynamic Q3_K_XL retains 100% accuracy at 12.8GB for Qwen3.8 27B.
Source finding
SUPPORTS
Radeon 3090 Ti
Q3_K_XL with full context and q4 KV cache runs on Radeon 3090 Ti max thinking.
Source finding
RELEASED
Unsloth -> Q3_K_XL
Unsloth released Dynamic Q3_K_XL quantization making Q3 viable for 16GB cards.
Source finding
BENCHMARKED AGAINST
Qwen3.8-27B -> Q3_K_XL
Unsloth Dynamic Q3_K_XL retains 100% accuracy at 12.8GB for Qwen3.8 27B.
Source finding

Source trail

The Kaitchup (via r/LocalLLaMA, 144 upvotes)r/LocalLLaMA

Graph sources

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