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Why does windows 7 64bit require more disk space and more RAM? is where I got the information.

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Related: 32-bit vs. 64-bit systems – galacticninja Feb 14 '13 at 10:19
up vote 9 down vote accepted

Windows 64 Bit includes several programs in both 32bit and 64bit versions (like Internet Explorer). This is one reason for the higher disk space requirement. The RAM is probably due to similar reasons and that the 64bit pointer just requires twice as much space.

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64 bit applications use larger variables and thus need more RAM.

An int (variable integer) on 32bit is generally 2 to the 32nd power, and on 64bit it's generally 2 to the 64th power.

As for the space requirement, Windows installs both 32bit and 64bit versions of it's default applications like Internet Explorer.

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No. Data types in 64-bit windows have the same size as their 32-bit counterpart except for pointers – Lưu Vĩnh Phúc May 7 '14 at 16:36

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