Running out of gpu memory..

As soon as I start a game, it chews up all available GPU memory (4gb) and crashes. Even on the lowest possible settings.

Is there anyway to tell the engine how much GPU memory I have?

Edit
Apparently I had no virtual memory assigned at all. Gave it 3gbs and the game doesn't crash... I have 16gb of ram... why use slower virtual memory...

edit
The game totally locked up the computer so I give up.

last edited by Hoogin

Please submit your DXdiag so we can see what are your PC specs.

I manged to make it run by restarting the computer with the new virtual memory and setting a frameratelimit