Why the 32-bit system can only operate 4g memory

Why the 32-bit system can only operate 4g memory

A lot of cells in computer memory, each cell is a byte, a byte has 8 bits. There are two states of each unit: 0 and 1.

So

• There are 4 combinations of two units;
• There are 8 combinations of 3 units;
• In turn ... ；
• n addresses have a 2 n-th-square combination.

32-bit computer, there are 32 units, you can control 2^32 units, that is, 2^32 bytes, that is, 2^32b, equals 4GB, so the 32-bit system computer can only control 4GB of memory.

Many people also think, now there are 64-bit system, then there are 2^64 units, about equal to 17,179,869,184gb,oh my god! so large memory, however, this is only a theoretical value, now because of the limitations of various technologies, it is impossible to have such a large amount of memory.

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Why the 32-bit system can only operate 4g memory