The second piece of our memory bus that is responsible for addressing the individual cells (typically a cell is comprised of 4 bits of data) of RAM is known as the address bus. The width of the address bus defines how much memory the processor could potentially address. For example, if we had a 24-bit address bus (like in an Intel 80286 processor), the processor would have the ability to address 16 MB of RAM (224 = 16,777,216).
If we had a 32-bit address bus (Pentium Pro, Pentium II) the processor could access a whopping 4 GB of RAM (232 = 4,294,967,296)! Now before you whip out you Visa card and dump ten grand on RAM, you must know that most motherboards today allow for a maximum of 2 GB of RAM. This limit is typically controlled by the chipset and BIOS of the motherboard.
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