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Microsoft Windows Vista 64-Bit Frequently Asked Questions - Page 2

post #11 of 32
Quote:
Originally Posted by t4ct1c47 View Post
Sorry to nitpick but the statement that 64-bit supports only 16TB maximum is wrong, it's actually 16777216TB, which equates to 16EB.

An operateing system would also have to be coded to support a certain amount of memory aswell. As an example, although 64-bit allows for up to 17179869184GB of RAM, Windows Vista Premium only allows 16GB, whilst the Business and Ultimate versions only support 128GB.

When working out the maximum amount of addressable memory you use the simple 2^x formula, where "x" is the address space available, 32-bit, 64-bit, 128-bit, etc...

Addressable Memory In 32-bit

2^32 = 4294967296 Bytes
4294967296 / 1024 = 4194304 KiloBytes
4194304 / 1024 = 4096 MegaBytes
4096 / 1024 = 4 GigaBytes

Addressable Memory In 64-bit;

2^64 = 18446744073709551616 Bytes
18446744073709551616 / 1024 = 18014398509481984 KiloBytes
18014398509481984 / 1024 = 17592186044416 MegaBytes
17592186044416 / 1024 = 17179869184 GigaBytes
17179869184 / 1024 = 16777216 TeraBytes
16777216 / 1024 = 16384 PetaBytes
16384 / 1024 = 16 ExaBytes
Microsoft limits the amount of memory vista can address itself...
I dont know why but that they way it goes...
In server 2003 its goes up to 2TB
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post #12 of 32
Thread Starter 
Quote:
Originally Posted by Panderas View Post
Microsoft limits the amount of memory vista can address itself...
I dont know why but that they way it goes...
In server 2003 its goes up to 2TB
Windows Vista Ultimate, Business, & Enterprise edition only support 128GB of RAM.
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post #13 of 32
Quote:
Originally Posted by Panderas View Post
Microsoft limits the amount of memory vista can address itself...
I dont know why but that they way it goes...


Remember, these are the people that thought 640k was enough memory.
    
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post #14 of 32
Can you please explain what WOW64 does, where can I get it? Thanks!
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post #15 of 32
Thread Starter 
WOW64 is short for Windows-on-Windows -not World of WarCraft-. It provides 32-bit emulation for existing 32-bit applications, enabling most 32-bit applications to run on the 64-bit version of Windows without modification.

Think about it as Sony PS2 (as WOW64) running PSOne games (as 32Bit apps).
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post #16 of 32
I thought it was backward compatable, like 32bit apps would run on x64 anyway?
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post #17 of 32
Do games benifit from 3+ gigs in vista ultimate 64 or does it act the same as with 2 gigs.
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post #18 of 32
nice faq, helped me alot. decided to take the plunge and just install vista x64, even though i dont have 4gb ram =]
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post #19 of 32
Nice FAQ. Hope you grow it over time. REP+

Next I need to upgrade my wife's computer from Vista x86. Anyone know of cheap ways to upgrade OEM (legally)?
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post #20 of 32
mispost
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