Nvidia has taken a historic decision. The company announced to end support for 32-bit operating systems. Nvidia has confirmed that after Version 390 of its graphics card driver it’s not going to release any drivers for 32-bit operating systems for any GPU architecture. It reiterates that drivers released after the aforementioned version will not operate and install on 32-bit operating systems.
Driver enhancements and optimizations, as well as operating system features in driver versions released after Version 390, will not be incorporated back into Version 390 or earlier versions. This decision impacts 32-bit versions of Windows 7, Windows 8 and 8.1, Windows 10, Linux, and FreeBSD.
Your graphics cards and chipsets will still work, but they won't get the security updates and bug fixes that come with new drivers. Nvidia intends to support critical driver security fixes until January 2019.
So, if you are still using 32-bit operating systems, it's time to upgrade your machines.