Yeah... If you have the time, install the latest one and check how much video ram 3DMark will say you have.
This is interesting: When I had the older AMD driver, Omegas 6512 and Hyperion 4.56 I got 1042 on 3DMark05
I upgraded to the latest AMD Driver, Omega 6553, Hyperion 5.00 and I got 1157
I downgraded Hyperion to 4.56 and kept the latest Omega and AMD drivers and I got 1182!!!! That's awesome considering I've only changed the drivers.