PostgreSQL can be expected to work on any of the following instruction set architectures (and operating systems): 64-bit x86-64 and 32-bit x86 on Windows and other operating systems; these are supported on other than Windows: 64-bit ARM and the older 32-bit ARM, including older such as ARMv6 in Raspberry Pi), RISC-V, z/Architecture, S/390, PowerPC (incl. 64-bit Power ISA), SPARC (also 64-bit), MIPS and PA-RISC. It was also known to work on some other platforms (while not been tested on for years, i.e. for latest versions).
PostgreSQL can be expected to work on any of the following instruction set architectures (and operating systems): 64-bit x86-64 and 32-bit x86 on Windows and other operating systems; these are supported on other than Windows: 64-bit ARM and the older 32-bit ARM, including older such, as ARMv6 in Raspberry Pi), RISC-V z/Architecture, S/390 PowerPC (incl. 64-bit Power ISA) SPARC (also 64-bit) MIPS and PA-RISC. It was also known to work on some other platforms (while not been tested on for years, i.e. for latest versions).