Why Windows 7 64-bit requires that much RAM?

August 27, 2009 at 09:14:14
Specs: Windows XP SP3

Why Windows 7 64-bit version requires twice as much RAM as the 32-bit version??
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If the 64-bit version has no more features than the 32-bit version, why do you need to doble your RAM?


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August 27, 2009 at 13:25:49

My guess is a 64 bit word takes twice the space as a 32 bit word even if only the first 32 bits (or even one bit only) are used.

Playing to the angels
Les Paul (1915-2009)

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August 27, 2009 at 13:33:32

What you are reffering to is the minumem ram requirement is higher beyond that the double amount does not apply.
As most Vista systems now have 2-3gb and some even 4, that does not mean that the 64 bit needs 4, 6 or 8gb.
However if you have 4gb or more 64bit, is required to be able to use all of it.
64bit is not designed with extra features like you would get going from Basic to Ultimate, it's more efficient at transferring data and able to to handle more ram then 32bit.

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August 27, 2009 at 21:37:35

Yes, it will require more memory from time-to-time, but it's not cut & dried. The reason M$ is suggesting at least twice as much memory is to allow for adequate contingencies since your 64-bit Windows comprises 32-bit libraries as well as 64-bit libraries for 32-bit app compability ... see below.

"The main disadvantage of 64-bit architectures is that relative to 32-bit architectures the same data occupies more space in memory (due to swollen pointers and possibly other types and alignment padding). This increases the memory requirements of a given process and can have implications for efficient processor cache utilization. Maintaining a partial 32-bit model is one way to handle this and is in general reasonably effective. In fact, the highly performance-oriented z/OS operating system takes this approach currently, requiring program code to reside in any number of 32-bit address spaces while data objects can (optionally) reside in 64-bit regions."

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August 28, 2009 at 03:44:15

About the same as windows xp for 32 bit (128mb) but for 64 bit probabaly only 512-1 gb minimum. But It would be slow so id go for about 2gb at least

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