OpenBSD is officially supported on the following platforms; snapshots and releases are generally available for them.
alpha Digital Alpha-based systems
amd64 AMD64-based systems
hp300 Hewlett-Packard HP 9000 series 300 and 400 workstations
hppa Hewlett-Packard Precision Architecture (PA-RISC) systems i386 Standard PC and clones based on the Intel i386 architecture and compatible processors
mac68k Motorola 680x0-based Apple Macintosh with MMU
macppc Apple New World PowerPC-based machines, from the iMac onwards
mvme68k Motorola 680x0-based VME systems
mvme88k Motorola 881x0-based VME systems
sparc Sun sun4, sun4c and sun4m class SPARC systems
sparc64 Sun UltraSPARC systems
vax Digital VAX-based systems