A change from a 32 - bit to a 64 - bit architecture is a fundamental alteration , as most operating systems must be extensively modified to take advantage of the new architecture .
That software has to manage the actual memory addressing hardware .
A change from a 32 - bit to a 64 - bit architecture is a fundamental alteration , as most operating systems must be extensively modified to take advantage of the new architecture , because that software has to manage the actual memory addressing hardware .