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max amount of ram xp allows? - Page 2

post #11 of 34
XP 32bit supports up to 4GB and x64 supports I think up to 128GB

but x86 by default reserves half of that memory for kernel usage. from what i hear you can use a /3GB switch in the boot.ini file to make it use only 1GB for the kernel.
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post #12 of 34
I though x86 could do 3gb and 64bit could do 16gb
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post #13 of 34
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post #14 of 34
No no no, you got it all wrong. 32 bit supports 4GB, but you have to subtract your GFX card's ram from that. 64 bit supports more than you'll ever use (at least in the next 5 years) - 16 terabytes.

Quote:
Originally Posted by h00chi3 View Post
with 32 bit, xp is reading 2.75 out of my 4 gigs with pagefile turned off. Once I get Vista Ultimate, it will be better.
Once you get ultimate you won't be better, unless you install the 64 bit version.

EDIT: here's a source - http://support.microsoft.com/kb/294418
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post #15 of 34
Quote:
Originally Posted by Boris4ka View Post
No no no, you got it all wrong. 32 bit supports 4GB, but you have to subtract your GFX card's ram from that. 64 bit supports more than you'll ever use (at least in the next 5 years) - 16 terabytes.



Once you get ultimate you won't be better, unless you install the 64 bit version.

EDIT: here's a source - http://support.microsoft.com/kb/294418
16 terebytes of virtual memory.

Quote:
The primary benefit of moving to 64-bit is the increase in the maximum allocatable system memory (RAM). Windows XP 32-bit is limited to a total of 4 GB, which is, by default, equally divided between Kernel and application usage. Using the /3GB switch in the boot.ini file forces Windows to limit the kernel to the upper 1GB and provides up to 3GB for applications. Windows XP x64 can support much more memory; although the theoretical memory limit a 64-bit computer can address is about 16 exabytes (16 billion gigabytes), Windows XP x64 is currently limited to 128 GB (237 bytes) of physical memory and 16 TB (244 bytes) of virtual memory. Microsoft claims this limit will be increased as hardware capabilities improve. In practice, most motherboards compatible with 64-bit processors do not support anywhere close to the maximum limit, and often retain the 4 GB limit.
http://en.wikipedia.org/wiki/Windows...al_x64_Edition

edit: ok now i dont know what to believe:

Quote:
Access More Physical Memory

Native x64 applications, combined with Windows Server x64 editions and suitable server hardware can access up to 2 terabytes (TB) of physical RAM, empowering today’s most demanding server applications.
http://www.microsoft.com/servers/64b.../benefits.mspx

edit: nevermind-- thats for Windows Server.
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post #16 of 34
I just thought I'd clear a few misconceptions up with regards to the maximum addressable memory in 32-bit and 64-bit environments.

When it comes to working out how much memory a CPU can address you use the simple 2^x formula.


32-bit (x86) = 4GB
x = 32

2^32 = 4294967296Bytes

4294967296Bytes / 1024 = 4194304 KiloByte
4194304KB / 1024 = 4069 MegaByte
4096MB / 1024 = 4 GigaByte


64-bit (x64) = 17179869184GB
x = 64

2^64 = 18446744073709551616Bytes

18446744073709551616Bytes / 1024 = 18014398509481984 KiloByte
18014398509481984KB / 1024 = 17592186044416 MegaByte
175921860444416MB / 1024 = 17179869184 GigaByte
17179869184GB / 1024 = 16777216 TeraByte
16777216TB / 1024 = 16384 PetaByte
16384PB / 1024 = 16 ExaByte


Bear in mind that this is in theory and no software currently requires the full load of memory x64 is capable of useing.
post #17 of 34
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Quote:
Originally Posted by t4ct1c47 View Post
I just thought I'd clear a few misconceptions up with regards to the maximum addressable memory in 32-bit and 64-bit environments.

When it comes to working out how much memory a CPU can address you use the simple 2^x formula.

32-bit (x86) = 4GB
2^32 = 4294967296Bytes
4294967296Bytes / 1024 = 4194304 KiloByte
4194304KB / 1024 = 4069 MegaByte
4096MB / 1024 = 4 GigaByte

64-bit (x64) = 17179869184GB
2^64 = 18446744073709551616Bytes
18446744073709551616Bytes / 1024 = 18014398509481984 KiloByte
18014398509481984KB / 1024 = 17592186044416 MegaByte
175921860444416MB / 1024 = 17179869184 GigaByte
17179869184GB / 1024 = 16777216 TeraByte
16777216TB / 1024 = 16384 PetaByte
16384PB / 1024 = 16 ExaByte
So in conclusion 32 bit xp can use 4 gigs? cool , im safe.
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post #18 of 34
Quote:
Originally Posted by Munchkinpuncher View Post
So in conclusion 32 bit xp can use 4 gigs? cool , im safe.
no it can use like 3.2 or 3.7 gigs
post #19 of 34
No... most of the above is wrong....

Any Windows 32-bit.... they all support up to 3.5GB without enabling PAE.

64-bit Windows.... it is 8GB, 16GB, or 128GB. Depending on version.

t4ct1c47, 64-bit OS artificially limit the maximum allowable memory.
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post #20 of 34
Quote:
Originally Posted by t4ct1c47 View Post
I just thought I'd clear a few misconceptions up with regards to the maximum addressable memory in 32-bit and 64-bit environments.

When it comes to working out how much memory a CPU can address you use the simple 2^x formula.

32-bit (x86) = 4GB
x = 32
2^32 = 4294967296Bytes
4294967296Bytes / 1024 = 4194304 KiloByte
4194304KB / 1024 = 4069 MegaByte
4096MB / 1024 = 4 GigaByte

64-bit (x64) = 17179869184GB
x = 64
2^64 = 18446744073709551616Bytes
18446744073709551616Bytes / 1024 = 18014398509481984 KiloByte
18014398509481984KB / 1024 = 17592186044416 MegaByte
175921860444416MB / 1024 = 17179869184 GigaByte
17179869184GB / 1024 = 16777216 TeraByte
16777216TB / 1024 = 16384 PetaByte
16384PB / 1024 = 16 ExaByte

Bear in mind that this is in theory and no software currently requires the full load of memory x64 is capable of useing.


Nice one, It's hard to argue with numbers and formula's. rep to you

While the formula's show the theory, in practice they differ greatly due to software and other hardware limitations as Ducki said.
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