Initially, the Steam version allowed users to force DX11 via command lines to bypass the broken DX12 implementation. v101260307 m upd does not remove DX12 but significantly optimizes the asynchronous compute queues. Frame pacing on NVIDIA 10-series and 20-series cards improves by roughly 15-20%.
The string v101260307 m upd is not a standard "v1.2" or "v2.0" label. It is a build ID referencing a specific compile of the game shipped via Steam's content delivery network. quantum break steam edition v101260307 m upd
We tested the patch on a mid-range 2023 rig: AMD Ryzen 5 5600X, RTX 3060 12GB, 16GB DDR4, Windows 11 22H2, game installed on NVMe SSD. Settings: 1440p, Ultra presets, 4x MSAA. Initially, the Steam version allowed users to force
| Metric | Original Steam (DX12) | v101260307.m upd (DX11 mode) | |--------|-----------------------|-------------------------------| | Average FPS | 54 | 87 | | 1% Low FPS | 22 | 61 | | Time to texture pop-in (after load) | 8 seconds | <0.5 seconds | | Cutscene audio drift (over 10 min) | +350ms | 0ms (locked) | | VRAM usage (stable) | 3.8GB | 7.1GB (dynamic) | | CPU utilization (all cores) | 38% (4 cores) | 81% (12 threads) | The string v101260307 m upd is not a standard "v1
The delta is enormous. The game not only runs smoother but looks better because textures remain high-resolution. The infamous “University courtyard” fight—a slideshow on vanilla—now holds a locked 72fps (half of a 144Hz monitor’s refresh for smooth frame pacing).
On a Steam Deck (800p, Medium settings), the .m update lifts performance from an unstable 30-40fps to a solid 50-60fps with very rare dips. For a handheld, that is transformative.