Is it necessary to get my graphic's card recognized?

The benefits range from slim to none. It is much more important to cap frame rates (this wouldn't have become undone) and address the 32 MB texture memory override (this might have, we would need to see a fresh deviceconfig.log from your TS3 user game folder for that not a dxdiag).

But you shouldn't have to keep redoing this. A better practice would be to keep a spare copy of those two edited sgr files on hand so they can put back into place should they ever need to be once the card is again recognized.