---
id: pr-vllm-25935
repo: vllm-project/vllm
pr: 25935
title: Fix INT8 quantization error on Blackwell GPUs (SM100+)
author: certainly-param
date: '2025-10-01'
url: https://github.com/vllm-project/vllm/pull/25935
source_category: upstream-code
architectures:
- sm100
tags:
- quantization
techniques: []
hardware_features: []
kernel_types:
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 99028fda449d920237561da163daf2e908e25535
inclusion_reason: kernel file changes
changed_paths:
- csrc/quantization/cutlass_w8a8/c3x/scaled_mm_helper.hpp
- docs/features/quantization/int8.md
head_ref_oid: dd0a7b008ba76d759a88b2d61d10f49dea2b4539
artifact_dir: evidence/pull-bundles/vllm/gh-25935
---
# Fix INT8 quantization error on Blackwell GPUs (SM100+)

- Repository: `vllm-project/vllm`
- PR: [25935](https://github.com/vllm-project/vllm/pull/25935)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/quantization/cutlass_w8a8/c3x/scaled_mm_helper.hpp`
- `docs/features/quantization/int8.md`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-25935`
