Does Windows Xp support more then 3GB of Memory ( DDR2 ) ?
Does Windows Xp support more then 3GB of Memory ( DDR2 ) ?
Does it vary? I thought it was a standard 3.something?
As I understand it the amount is dependent on the motherboard architecture and the chip set being used.
Anywhere from 2.75 to 3.5GB might show up.Of course that's just what I've read but there definitely is variance.
Ahh. i didn't know that. maybe because I have used all Gigabyte boards with ICH9/10 I get the same reading? Then again my memory couold be failing me and I just assume its the same number.
I thought the hard limit was @ 3.25GB, then you subtract any that's shared with the video.
"I am the one who knocks."- Heisenberg
Only relating what I've read.I've seen people claim even 3.7 but you would know better than I.
Not necessarily.
I get all my information from Popular Mechanics.
"I am the one who knocks."- Heisenberg
As I understand it....
2 to the power of 32 = 4,294,967,296 bytes
4,294,967,296 / (1,024 x 1,024) = 4,096 MB = 4GB
That's total addressable memory space, which has to include system and graphics ram, PCI memory range, ACPI, and some other minor stuff. In practice therefore, anyone with a 512mb gpu for example has to subtract that from 4gb, but also subtract some other stuff, most likely leaving them with around 3gb.
Originally Posted by http://support.microsoft.com/kb/946003/"Due to an architectural decision made long ago, if you have 4GB of physical RAM installed, Windows is only able to report a portion of the physical 4GB of RAM (ranges from ~2.75GB to 3.5GB depending on the devices installed, motherboard's chipset & BIOS). This behavior is due to 'memory mapped IO reservations'. Those reservations overlay the physical address space and mask out those physical addresses so that they cannot be used for working memory. Significant chunks of address space below 4GB (the highest address accessible via 32-bit) get reserved for use by system hardware: BIOS – including ACPI and legacy video support; PCI bus including bridges etc. PCI Express support will reserve at least 256MB, up to 768MB depending on graphics card installed memory", explained Hilton Locke, Microsoft Test Engineer
Last edited by MAdIrish; 02-27-2009 at 03:18 AM.
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