Not just in the Ram but in the Virtual memory page as well, Windows allocates 50% of the Ram amount in the Virtual memory page as additional VRam. So, if you have lets say 48GB of Ram then Windows allocates 24GB of Virtual Memory to add onto you dedicated VRam so if your card is, lets say 8GB, add the 24GB for a total of 32GB of available Virtual Ram. Just take a look at your Task Manager in the Performance tab and then click on your GPU. it will show you how much Windows is allocating for you Video Memory.