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32bit application, and memory?

C

Calyus

n00b
Joined
Jun 29, 2007
Messages
15
Hey everyone, back with a new question. I am thinking about adding some more RAM to my machine. This in particular It will be used for pretty much everything.. From Gaming and Small Video Editing (Filming my mass pwnage), to Browsing the net, and listening to music. I've been reading up on how much ram I can actually use, now even though my MOBO may support 16gb; WinXP Home is unfortunately a different story. Now, I know I can change to Linux, WinXP Pro, Vista and all the likes, but that I'd rather not do.. I don't think anything I'm going to be doing is going to require more then 4gb of ram. Now my question is, with a 32bit application such as WinXP it only supports 4gb, although through somethings I've read, and things I've heard from friends it only displays 3gb.

Now with the back story over (Whew!) Is this true? If it's displaying 3gb, is it really using 4? Whats the scoope? I of course don't want to buy something, thats not going to be utilized.
 
BillParrish said:
http://support.microsoft.com/kb/929605/en-us

nope it cant use it because of memory mapped I/O.

A google of http://www.google.com/search?hl=en&q=windows+ram+usage+4Gb brings up a ton of info, some of it wrong.

consider a 2x1GB kit and a 2 x 512GB kit for a total of 3GB all by same manuf and same product line.
Click to expand...



Well I read some of the info in that link, and found this:

"Various devices in a typical computer require memory-mapped access. This is known as memory-mapped I/O (MMIO). For the MMIO space to be available to 32-bit operating systems, the MMIO space must reside within the first 4 GB of address space.

For example, if you have a video card that has 256 MB of onboard memory, that memory must be mapped within the first 4 GB of address space. If 4 GB of system memory is already installed, part of that address space must be reserved by the graphics memory mapping. Graphics memory mapping overwrites a part of the system memory. These conditions reduce the total amount of system memory that is available to the operating system.

The reduction in available system memory depends on the devices that are installed in the computer. However, to avoid potential driver compatibility issues, the 32-bit versions of Windows Vista limit the total available memory to 3.12 GB. See the "More information" section for information about potential driver compatibility issues."


So since I have 2x X1950 w/ 256MB of Ram, this is limiting me even further? Even then, is 3gb going to work?
 
To see and utilize four gigs of RAM, you'll need a 64 bit version of Windows. Vista x64 is a much more mature platform than XP-64, and may be a better choice.

Mark.
 
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