...running fine here also in campaign mode using heavyly modded living SH3 V5 including Flakmomkeys interriors and all other important stuff like WAC subs and other important additional mods, which are up to date at current.
it run on XPSP3 2GB ram, grafics mem 512, using XP`s /3GB start option in boot ini, together witch patched SH3.EXE to allow usage of more than 2GB mem.