引用自互联网
By definition, a 32-bit processor uses 32 bits to refer to the location of each byte of memory. 2^32 = 4.2 billion, which means a memory address that's 32 bits long can only refer to 4.2 billion unique locations (i.e. 4 GB).
照这样子算，一个32位的处理器所支持的内存大小公式为：
2^32/1024/1024/1024 = 4 G
那么64位的处理器所支持的最大内存为
2^64/1024/1024/1024 = 17179869184 G
17179869184 G = 16777216 T
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