7950 7970 give you a gold tier reward for a choice of 3 games.
7800 series give you a silver tier reward for a choice of 2.
7790 7770 give you 1 choice in bronze tier.
You have to purchase from selected retailers, the retailer will give you the reward code :) Participating retailers are listed if you scroll down. It's the same for US/UK.
They are still adding games, they've hinted battlefield 4 upcoming later possibly in December.
So I'm looking at silver tier and I am underwhelmed.
There are two 2013 titles on there and one is DLC (Blood Dragon). The others are 2012 or older (and I own all of the good ones from there), and two of them are Dirt games. The only one from that list I would want is DMC, and even then I don't have any great desire to play it.
I remember when trasharmdsister bought his new card, they gave him BioShock Infinite (at launch). Does Nvidia have better deals on these or something?