for now i'd roll back even more (314.22). the 320.xx and 326.xx series of drivers are bugged, and cause ocassional system crashes and lock ups.
i started experiencing both (screen goes black, then returns and gives a message that driver has crashed and recovered as well as whole pc just freezing) ever since updating to 320.49.
i started experiencing both (screen goes black, then returns and gives a message that driver has crashed and recovered as well as whole pc just freezing) ever since updating to 320.49.