It was probably on the box the card came in. If you no longer have it or it’s not there, look for a sticker on the front or the back of the video card itself. (They often use the back since the stickers can be long and there’s more unbroken flat space on the back.)
For registering the card, you’ll probably need both the product ID and the card’s serial number. Both are usually on the same sticker.
Try newegg.com, or XFX’s website.
It was probably on the box the card came in. If you no longer have it or it’s not there, look for a sticker on the front or the back of the video card itself. (They often use the back since the stickers can be long and there’s more unbroken flat space on the back.)
For registering the card, you’ll probably need both the product ID and the card’s serial number. Both are usually on the same sticker.