No... PC architecture isn't antiquated... it's a simple matter that games are primarily designed around console architecture contraints and thus aren't coded to properly take advantage of the far more capable PC architecture and hardware.The antiquated pc architecture really gets in the way. It may all be super fast at a component level, but bringing it all together and moving assets around in modern more demanding games is just going to get worse.
This is literally consoles holding PC back.. and suffering from it.. because you can take the best console games and port them to PC, and they'll work by and large... but you can't do the same the other way around.
That's why it is currently the way it is.