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max amount of ram xp allows? - Page 3

post #21 of 34
Quote:
Originally Posted by rx7racer View Post
Nice one, It's hard to argue with numbers and formula's. rep to you
Except he's wrong.

Theory is correct... real world application is false.
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post #22 of 34
Quote:
Originally Posted by DuckieHo View Post
t4ct1c47, 64-bit OS artificially limit the maximum allowable memory.
Rep if you elaborate a little for me or post a link explaining what you mean.

Quote:
Originally Posted by DuckieHo
Theory is correct... real world application is false.
Sorry, I forgot to add that the operateing system also has to be written in the appropriate way to take advantage of the extra possible memory. Though I can't see this being much of an issue for a few years at least. To be fair, none of us can be certain of the full performance capabilities of such large amounts of RAM, and it will be some time indeed before we start useing that much RAM. Then again, most performance users have 2048MB to 4096MB in their systems these days, which is a darn site more than the good old 16KB.

As for XP only being able to address 3.25GB or 3.75GB of RAM I've always thought that the graphics card memory is knocked off when users have 4096MB of main RAM in their system.

W00T!! Second Flame!
post #23 of 34
from everything i've hear 32-bit OS's are 3.5gb - video ram. so probably either 3.25 or 3gb for most people
post #24 of 34
Quote:
Originally Posted by t4ct1c47 View Post
Rep if you elaborate a little for me or post a link explaining what you mean.
No one needs (or can afford that much RAM).... It would also take a nuclear reactor or three to power it that much RAM. OS developers arbitrarily set a limit to supported RAM.

http://en.wikipedia.org/wiki/Windows...ns_and_pricing
Quote:
As with Home Basic, only 1 physical CPU is supported.[6] 64-bit Home Premium supports up to 16 GB of physical memory, and will be supported until 2012.

As for why it is 3.5GB and not 4GB.... Windows reserves .5GB for devices. Even though they aren't always using that .5GB it saves room for addresses just in case.
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post #25 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.
yea that is theoretical, as an OS windows XP x64 is only capable of utilizing 128GB of physical memory.
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post #26 of 34
Any 32-Bit OS can handle 3.2-3.5GB of Ram.
Any 64-Bit OS can handle 8+GB of Ram.

The end.
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post #27 of 34
Wow i really didn't know that xp 32bit couldn't hold 4gigs of ram or more and i was about to get more lol.Owell ill get a kit og 2 gigs Hyper x 800Mhz to make my pc faster + my two 512mb so it will make 3gigs
 
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post #28 of 34
Quote:
Originally Posted by Ninja_Boy View Post
Any 32-Bit OS can handle 3.2-3.5GB of Ram.
Any 64-Bit OS can handle 8+GB of Ram.

The end.
Best way to reference it in practice .
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post #29 of 34
I would not do that. It will screw up your timings and your will be unable to overclock and you will run slower (unless you actually need more than 2GB of ram). I would suggest keeping your ram until you upgrade to a 64-Bit version of Vista or XP, then, getting 4x1GB of the same ram.

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post #30 of 34
Quote:
Originally Posted by DuckieHo View Post
As for why it is 3.5GB and not 4GB.... Windows reserves .5GB for devices. Even though they aren't always using that .5GB it saves room for addresses just in case.
I used to think that it specifically related to the graphics card, seeing as most people I've come across who run 4GB of RAM tended to have cards with larger amounts of memory (512MB). Anyway, cheers for the heads up, I'm gonna have a butchers into this. Rep +1
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