Not really locked, they scan your system for the serial number of your gpu, as well as hardware inside. If it's the same hardware it would normally lock you out from redeeming if you've already redeemed in the past. If you take the card and put it in a different system, the hardware id's would be different for the overall system, so you could still redeem. It's a bit weird though, I redeemed the last bundle for for honor, and was still able to redeem destiny 2 for myself as well. Didn't really change any hardware, I did have a windows reinstall though, not sure what they limit the redemption by. It's a bit weird, that's for sure.