Bluesnews is reporting that NVIDIA will no longer release drivers for 32-bit operating systems for any GPU architecture following the 390 release.

Later driver release versions will not operate, nor install, on 32-bit operating systems. Driver enhancements, driver optimizations, and operating system features in driver versions after Release 390 will not be incorporated back into Release 390 or earlier versions. This impacts the following operating systems:

Microsoft Windows 7
Microsoft Windows 8/8.1
Microsoft Windows 10
Linux
FreeBSD

NVIDIA intends to support critical driver security fixes until January 2019. For more details on product security, see http://www.nvidia.com/security.