The "3x2B" revision represents the third major iteration of the layout, optimized for a 2-layer PCB design with improved thermal relief.
PCI Express x1 (compatible with x4, x8, and x16 slots). pi40952 3x2b driver
Quick tagline:
Commonly refers to version for newer Windows builds Architecture Supports both 32-bit (x86) and 64-bit (x64) systems Installation File The "3x2B" revision represents the third major iteration