S-GAME announced an approximately 5 GB day-one update for ray-tracing/path-tracing performance and bug fixes. Preload users should install it before playing; the notice gives no build number.[1]
On this page
Specific driver guidance supersedes generic preload advice
The October 28 letter recommends NVIDIA 617.42 with a clean installation after reported 621.01 instability. This is dated, game-specific advice; check subsequent developer and vendor notices.[1]
Keep patch size separate from staging space
The earlier preload notice asks for 300 GB free, while the Steam listing gives 145 GB available space. Neither figure makes a 5 GB patch download an exact measure of its temporary installation needs.[2][3]
Check the vendor hotfix scope as well
NVIDIA lists targeted 621.12 hotfixes. S-GAME separately recommends 617.42. These notices do not establish a universal game-performance fix.[4][1]
How the linked references were handled
Affected references
- Phantom Blade Zero PC installation and first-launch checklistUpdated
Reconciled the checklist against the newer driver exception and preload-update instruction during initial content preparation.
- Phantom Blade Zero PC requirements and capacity checkerNo change needed
No revised RAM, CPU or GPU requirements are supplied in this update notice.
Sources & verification
Facts last checked Oct 31, 2026. Checking a source does not change the page’s update date.
- Reason and Madness: launch update and driver guidance Soulframe Liang / S-GAME · official · Published 2026-10-28 · Checked Oct 31, 2026
Announcement text verified through Valve’s public ISteamNews API. Driver advice is dated, game-specific guidance; check for newer official notices.
Original language: en - Ready your blade! S-GAME / Steam · official · Published 2026-10-26 · Checked Oct 31, 2026
Announcement text verified through Valve’s public ISteamNews API; the web article can be access-restricted.
Original language: en - Phantom Blade Zero on Steam S-GAME / Valve · official · Checked Oct 31, 2026Original language: en
- NVIDIA Hotfix Display Driver 621.12 release notes NVIDIA Support · official · Published 2026-10-27 · Checked Oct 31, 2026
Vendor hotfix notes are narrower than a universal game performance guarantee.
Original language: en
Page history
Added the NVIDIA 621.12 vendor notice and clarified the limits of the dated driver recommendations.
Published after checking the listed primary sources and attributed reporting; exact game build remains unconfirmed.
A source and a little context help us keep this guide useful.