Less RAM available after CMOS clear

Sandstorm3000

Honorable
So i posted a thread in the morning, however ill simplify it a bit.
(since it got no replies)
So i OC'd my CPU which wasn't really a succes after all so i decided to undo it, however i couldn't acces the BIOS in the normal way by pressing ''Delete'' so i took out the little battery and put it back in, everything seems to work normal only one thing is weird.

Windows shows that i have 4GB Ram, but only 2,94GB Usable which wasn't like this before.

Note: My BIOS says there is 3008 MB of RAM available. Specs are in my signature.

Edit: Im not sure how to remove the old thread.