changing video memory (laptop)

my ati 200m graphics card in my laptop uses 128mb of the 1gb (1024mb) of ram the laptop has, will i be able to boost it up to say 256mb or even higher?

i have checked bois and it says 32mn 64mb 128mb but is there any other way to change it?

laptop is a hp pavilion ze2355ea(ze2000)

if it is possible will i notice a big difference in gaming?

:cry:

No, that's the only way to change it.

You might be able to find a modified bios, but it is unlikely that they would modify that area of the bios anyway.