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ComfyUI Bugs on Turing GPUs Detailed: FP16 Overflow, CUDA Alloc Crash

By PulseAugur Editorial · [1 sources] ·

A Reddit user detailed three bugs affecting ComfyUI on Turing architecture GPUs, specifically the Quadro RTX 6000. The primary issue identified was an FP16 overflow in PyTorch's `torch.mm()` function when input values exceed approximately 44, leading to infinite values and black image outputs. This bug, present in PyTorch 2.12.0+cu126, can be mitigated by using `.bfloat16()` instead of `.half()`. Additionally, Turing GPUs may encounter a `cudaMallocAsync != native` crash at startup, which is resolved by setting the `PYTORCH_CUDA_ALLOC_CONF` environment variable. The user also noted that persistent issues could indicate a hardware defect in the GPU's VRAM. AI

IMPACT Addresses specific software bugs impacting AI image generation workflows on certain hardware.

RANK_REASON User-reported debugging of software issues for a specific tool and hardware.

Read on r/StableDiffusion →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

ComfyUI Bugs on Turing GPUs Detailed: FP16 Overflow, CUDA Alloc Crash

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Signal score
0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
User-reported debugging of software issues for a specific tool and hardware.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, infra
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High
Clearly on-topic for AI-industry coverage.
Story freshness
56 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

COVERAGE [1]

  1. r/StableDiffusion TIER_2 English(EN) · /u/rtsitola ·

    I spent 8 hours debugging why ComfyUI was broken on my Quadro RTX 6000. Found 3 independent bugs. Here's what I learned.

    <!-- SC_OFF --><div class="md"><p>If you're running ComfyUI on a Turing GPU (Quadro RTX 4000/5000/6000/8000) and getting black images or NaN errors, this post is for you.</p> <p>## The Symptoms</p> <p>- ComfyUI output: pure black images (10 KB PNG instead of 1.5 MB)</p> <p>- Cons…

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