On Wed, 2008-10-01 at 12:13 -0500, Roger Heflin wrote:
The chipset is not capable of remapping under certain conditions, or the bios won't do it because it would cause lower memory availability with windows. Some bios can only remap entire dimms, and that would result in less memory for a 32-bit only OS so they don't do it even though it would result in more memory for a 64-bit/PAE os.
b) How do XP and Vista handle this ? Are they limited to 3GB of RAM too ?
In the case of a bios limitation they would also be limited to only 3GB.
Here is the spec sheet for my laptop. http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01490775&cc=us&...
It says: "Memory 4096 MB Memory Max Up to 4GB DDR2 (Up to 1 GB may not be available due to 32-bit operating system resource requirements)"
This machine ships with a 64 bit version of Vista. I didn't think to check what the available memory was under Vista. I don't have it installed anymore.