Why use XGbytes address space for a DRAM controller

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#1. Does "64GByte address space" means 64*(1024^3)8 of different addresses? #2. Or 64(1024^3) different addresses and each locations is 1 byte wide. According to the documentation that I am reading (not sharable) a 36 bits address is used (2^36=64G). Thus the expression of "64GByte address space" means #2. But why not use just "64G address space"? Is there a convention for this?

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