Quote Originally Posted by Dramoth View Post
In my case, I am losing about 1.5Gb of main ram. I am starting to think that it might actually be the motherboard thats causing the problems.
That's correct but you may only need to change a BIOS setting. See the "Workaround" section of the following article, particularly "memory remapping feature" and the last bullet point:

http://support.microsoft.com/kb/929605