Update, November 17th @ 7:21pm: NVIDIA has released 375.95 Hotfix to fix this issue. They are working on getting it WHQL certified for their website and GeForce Experience. You can download and install it directly, though.
Update, November 16th @ 12:56pm: NVIDIA has reproduced the low memory clocks issue, found its cause, and are working on a fix. They believe it only affects certain factory-overclocked cards. It is obviously a high priority, so a hotfix driver will likely be issued (unless they can get it WHQL certified quick enough that it would be pointless).
Original post below:
NVIDIA has just released a new graphics driver. GeForce Game Ready 375.86 provides optimized support for Ubisoft's Steep, which is an open-world game with wingsuiters, skiers, snowboarders, and paragliders. It also rolls in extra optimizations for previous game ready games that are receiving patches: Battlefield 1, Civilization VI, and Tom Clancy's The Division.
Before you install, though, there is one particularly annoying issue that is being reported on GeForce forums. NVIDIA is currently investigating reports that certain, but not all, Pascal GPUs are having their video memory stuck at 810 MHz, leading to (as you would expect) severe performance loss. It's possible that the affected users are all running a specific overclocking application or something. If you are in a bit of a rush and don't want to put up with potentially rolling back, then you might want to skip the version.
Thankfully, both discrete graphics vendors have been releasing multiple versions per month. The wait shouldn't be too long.