32 bit 64 bit ram rom

When you load a file, its contents are stored somewhere in RAM.

It makes no sense to run a 32 bit OS on a computer with 16 GB RAM,
as the 32 Bit OS cannot use but 4 GB of it.
Running a 64 bit OS on a computer with only 4 GB RAM also makes no sense
as a 64 BIT OS needs more RAM than a 32 bit OS

Please have a look here:
http://windows.microsoft.com/en-us/windows/32-bit-and-64-bit-windows#1TC=windows-7[^]

RAM and ROM are different things (and generally, you don't get ROM anymore, it's Flash RAM these days so it is easier to update - true ROM requires a physical replacement of the chip(s))

ROM contains a minimum subset of the instructions to "work" the hardware: it interfaces with the keyboard, display adapter and HDD to load the "real" code from the HDD boot sector and start loading the real operating system. After that, it pretty much isn't used except for the very, very low level stuff to actually access hardware (and even then it's generally copied into RAM because it tends to be a lot, lot faster)

RAM is the memory your OS and applications use: all downloading and suchlike is handled by code running in the RAM - though the ROM code may be used for low level disk access to save the file, it depends on the system.

Ignore the ROM for the moment: chances are you will never need to use it directly, and it will only add confusion! :laugh: