I'm running a Dell Studio XPS, with quad core processor, two threads per core, with 12GB of installed RAM. According to Windows, only 7.99GB of that RAM is usable.
The really weird part is, up until two weeks ago I only had 8GB of RAM and then only 3.99GB was usable. So 4GB of RAM is consistently being taken.
I've checked in every screen, under every option in my BIOS and there doesn't seem to be a memory option there at all (that's a damn Dell for you). I've read that a lot of times this can occur because of the video card stealing some RAM for itself.
Is there some way I can check this, other than the BIOS? I have onboard graphics, not a separate card.
I'm running Windows 7 64-bit.