OCP Microscaling (MX) Data Formats Specification

Fields

id

sources/qhw-src-mxfp-paper

URL

https://www.opencompute.org/documents/ocp-microscaling-formats-mx-v1-0-spec-final-pdf

Publisher

Open Compute Project

Kind

spec-sheet

Published

2024-01-01

Accessed

2026-10-04

notes

OCP MX specification. Defines the microscaling block-scaled formats: MXFP4 (E2M1 elements, E8M0 power-of-two scale per 32-element block), MXFP6 (E3M2/E2M3), MXFP8 (E4M3/E5M2). The key distinction from NVFP4: MX uses power-of-two E8M0 scales (no fractional scales), NVFP4 uses E4M3 fractional scales per 16 elements plus a per-tensor FP32 global scale. MX is an open standard; NVFP4 is NVIDIA-proprietary. Both are W4A4 on Blackwell.

Notes

OCP MX specification. Defines the microscaling block-scaled formats: MXFP4 (E2M1 elements, E8M0 power-of-two scale per 32-element block), MXFP6 (E3M2/E2M3), MXFP8 (E4M3/E5M2). The key distinction from NVFP4: MX uses power-of-two E8M0 scales (no fractional scales), NVFP4 uses E4M3 fractional scales per 16 elements plus a per-tensor FP32 global scale. MX is an open standard; NVFP4 is NVIDIA-proprietary. Both are W4A4 on Blackwell.

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