not true ram controls the majority of pc rimings assumming the processor can handle those speeds.. when your able to override the error checking and fetching everything is sped up even dvd ripping.
the problem with this is not many chipsets allow you to do this and the ram capable of this is usually very expensive for newer motherboards and older ones it's cheaper since you can sub for something alot faster...
anyways back to the orginal point.
if you have something tahts 10 characters long and you know its 10 char long, why check its 10 if its always will be 10 so we take that error checking away and lets say instead of 3 steps (12 which is 26 min for example) we now do 2 (8 which is 20 min for example). thats a whole milisecond saved for that 1 instance. repeating this logic you will get a significant amount of time saved. ripping has always been limited by the ram of a computer, its hard drive and proc btw.
note that these numbers are in no way actual calculations since it isn't possible to be a perfect 12 realistically it would be 13^33333-
this was just an example on how ram does matter google it if you want a more detailed explaination.
the p4's (gen 2) and on take advantage of this with its 533 fsb+ which is capable of acheiving a very good cas + ram speed needed to notice a differance.