There are cards that through Gigabyte, have a special code to them that are made with some parts removed, they are designed to be *Entry* level cards and not really good for any current games, and a GS is usually in that level, but depending on the brand you can get drivers that in some cases are designed to work with that and function normally.
I have run into cards like this rarely, but those people did know about the issue.
I would have to re-read the info I was givin a long time ago.
Eitherway, they may not do that anymore.