Hey! So im thinking about replacing my windows desktop with a rMBP, but the gt650 bothers me a bit, meanwhile iv been looking around for external gpu solutions that uses the thunderbolt standard but havent found any... yet!!?? my question is: how much will a thunderbolt gpu improve the already not to shabby gaming performance on a rMBP, and will it be able to use both ports for extra "bandwidth". If it was possible to push the rMBP 3dmark06 score over 22000 id be all over it!! fo sure!