4th Gen iPad

I have a 3rd generation iPad that I really love, but it's only 16GB, and I'm tired of uninstalling apps just to put more on it. I was about to pull the trigger on a 64GB 4th generation refurb from Apple for $500($550 with tax) but after checking Ebay, I bought one from a place that's selling brand new 128GB 4th generation models for $500 no tax & shipping.

My question is, and I'm sorry if it's dumb, will I notice much of a performance difference coming from a 3rd gen to 4th gen? I play a lot of Real Racing 3 and other graphically demanding games, I'm not looking to get my mind blown, but do any of you have experience going from 3rd to 4th generation devices?