RivaTuner is the best tool i have found. It does work on both nVidia cards and some ATi cards as well. But it is simple asn easy to use and it does overclock it nicely. Plus you can control fan speeds.
But in the spirit of the question he asked how to upgrade the Memory in his card. OC jsut boosts the card performance.
the mother board is above 945 chipset
u can also able to set video memory in bios i think
provided it should be onboard video card
in bios there is one option called DVMT = 128MB or MAx or 256MB like that
trying to play a game. says not enough video memory. just installed it. uninstalled other games not using. still says the same. i'm a relative novice at this and could use some help. can i get more freed up memory?