Looks like no more cheap Nvidia codes.
They now check that you actually have GPU and each GPU can be used only for one redemption.
Q: Are there additional requirements for me to redeem my coupon?
Graphics Card Requirements- Some coupons can only be redeemed on selected graphics card. These coupons are typically tied to a graphics card purchase or promotional giveaway. Please make sure your graphics card is installed before redemption.
Q: Why must game bundle code redemptions be completed with a qualifying graphics card, desktop or laptop?
Game coupon codes offered as part of a qualifying GPU or PC purchase are intended for use by the purchaser. Redeeming the code on a qualifying system helps NVIDIA verify the game is redeemed by the purchaser. Please note that only one game copy can be redeemed per qualifying GPU.
Even though this means no more cheap codes for most people this also means that you won;t be able to give away codes for games you don't want.