Apple ship MBook pro with GT650 but 512MB ram. Apple won't ship a crippled product shipping less than required memory.
just a small example: My desktop GPU is HD5670 512MB GDDR5. According to reviews (and what i have seen myself) 512MB is the max memory HD5670 can use. GT630 will fall in line with a desktop GT520 which is around half as fast as my GPU. Now think, if a GPU 2 times as fast as yours can't use 1GB VRAM will your laptop GPU have any use with a 2GB GPU? It doesn't matter if GDDR5 is used or DDR3, 512MB is the max limit for GT630M.
And increasing resolution will only tax your GPU and lower framerates.