the 452 (i think) patch you see on servers is mainly just a server side patch. it fixes a lot of little connection issues and mainly makes the game easier to play with the heavy load of anti-cheat utilities running as well as using new hardware and other updates since the release of 436. its completely compatible with 436 and ive read lots of places that its best not to update your game if your only playing. only go to 452 for servers.