It’s an NVIDIA specific term that is the abbreviation for GPU System Processor. It’s a RISC-V core that does all sorts of management tasks on a modern Nvidia card, mostly related to task setup, resource allocation, context switching, adjusting clock speeds, etc.

I have one of these, but only use it for SteamVR. Does this mean I can’t update either?

AFAIK, the drivers come from Windows.

Edit:

From the article:

Existing Windows Mixed Reality devices will continue to work with Steam through November 2026, if users remain on their current released version of Windows 11 (version 23H2) and do not upgrade to this year’s annual feature update for Windows 11 (version 24H2). This deprecation does not impact HoloLens.

Well fuck. This headset is the only reason I keep a Windows PC around at all.