the biggest portion of dropouts are caused by the soundcard and its drivers, not the CPU and RAM.
as Jonsey asks: what are you full systems specs including your interface?
also, which driver mode are you using and what are your latency settings?
those will be the biggest factors in dropouts
soundcard drivers will be the biggest factor in crashes
also: when the "white screen of death" appears - it should give you some information about a specific driver or piece of hardware which is causing the conflict. what is that?