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post #11 of 22
Using Vista Ultimate 32-bit,it shows 3.5+ out of 4GB's,so in actuality I'm only using 3.1 or so ?

Edited by reezin14 - 5/28/08 at 1:14pm
 
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post #12 of 22
Comment on article
Quote:
f any of you have ever done C or C++ programming in a Win32 app, then you are aware of the fact that Microsoft uses 0xcccccccc for the default initialization of pointers, etc. That value is 80% between 0 and 4 GB. Also, (everyone knows) Windows uses virtual memory and, unless I am mistaken, sets up special conditions for debugging. The memory above 2 GB is used for that purpose.

On top of that you have memory mapped devices (such as video cards, and really any PCI or newer device). They all require memory and generally acquire it from 4GB down toward 0.

Basically, there are legacy reasons why Windows does not access all memory.
Source
http://www.geek.com/windows-xp-maximum-memory/

Your official article is on the MSDN blog here
http://blogs.msdn.com/hiltonl/archiv...m-problem.aspx
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post #13 of 22
Quote:
Originally Posted by XFreeRollerX View Post
Mind showing me where video cards impact OS readings?

I had 4GB of RAM, 1GB AT 2900XT, and 32bit XP.

I used 3.2 something GB of RAM. No impact.

Prove me wrong with an official article
Fine... how reading EXACTLY where your addresses are going?

Open Device Manager.
Select View.
Select Resource By Type.
Expand memory.

Post a screen shot.
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post #14 of 22
And to be perfectly clear, windows uses a specific addressing scheme to reference both your system ram and your video ram. If your video ram goes over the system reservation of video ram, you start drawing off the addressing scheme from your system memory. Basically your given a 4GB chunk of addressing scheme. You can only have so much within it and memory addressed devices such as Video cards take priority over your Ram to the point of what I would guess to be the minumum amount needed to run windows (768 MB if I'm not mistaken.)
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post #15 of 22
32-bit OS will SHOW you how much RAM you have, but it will not utilize all said RAM.
    
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post #16 of 22
Quote:
Originally Posted by DuckieHo View Post
Fine... how reading EXACTLY where your addresses are going?

Open Device Manager.
Select View.
Select Resource By Type.
Expand memory.

Post a screen shot.
I didn't realize my NIC would show up there....COOL!!!!
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post #17 of 22
Quote:
Originally Posted by The Mad Mule View Post
32-bit OS will SHOW you how much RAM you have, but it will not utilize all said RAM.
This could be where I messed up

I remember XP showing that I 'had' ~3GB of RAM and I had a 2900 XT 1GB VRAM card isntalled...

I no longer have the system but you proved your point. Seems I never looked deeper into my system's capabilities at the time.

Good work on the fast proof tho, I was astonished at how fast you replied with all that lol
    
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post #18 of 22
Quote:
Originally Posted by The Mad Mule View Post
32-bit OS will SHOW you how much RAM you have, but it will not utilize all said RAM.
If so why cant i see more than 3.25Gb in XP?
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post #19 of 22
Quote:
Originally Posted by Asce View Post
If so why cant i see more than 3.25Gb in XP?
I guess XP didn't get the patch Vista did? Vista32 will SHOW 4GB now, but I guess XP still doesn't...

It doesn't matter anyway, as NO 32bit OS will actually use it.
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post #20 of 22
Vista32 will show 4Gb if its installed but still wont use 4GB.
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