Graphics Card Questoin [ATI Mobility Radeon HD 6370]

I've noticed this for quite a while now and just didnt really paid much attention to it, but the first time I ran dxdiag when I got this laptop a while back, I noticed that the Memory on my GFX card is at 2GB when this card should only be 1GB. Heres the screenie of my dxdiag:



And here's a screenie from Speccy again:



So, what do you think? Thanks in advance mate.

Here's a screen shot of my mobo spec.

Spec Summary:




Spec Mobo:



Thanks in advance guys!

This should help explain it,

Video Memory Virtualization - A Brief Guide