7670m vs 6650m

Hello,

i was about to purchase a laptop with a 6650m and a a6 3400 but i noticed another with a 7670m and a 3420m

so is the 7670m really much better than 6650m
or just a rebrand
i want to know the performance in games

my problem being i have to cancel my order and wait for a laptop with 7670m to be available near me

is this really worth it

also 7670m has usually 2gb video memory will this make a substantial difference