On Dec 7, 2011, at 10:05 AM, Nomen Nescio wrote: >> Yes, exactly. OpenBSD supports >4GB RAM only on 64-bit architectures. > > Isn't that a limitation of Intel x32 rather than an OpenBSD limitation?
Yes and no; higher-end Intel 32-bit parts from the Pentium Pro upward supported Physical Address Extension, which (IIRC) gave 36 bits of physical address space (similar to how you could have 18 or 22 bits of address space on a 16-bit PDP-11 through the magic of memory mapping). Your virtual addresses are limited to 32 bits still, so any given process could only use 4 GB, but the total amount of RAM in the system could be larger. - Dave
