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I think that it's safe to say that your card has had it to be honest.
Nah it's not really a case of that. There's two forms of knackered with a graphics card: -Ok if it has had it, then how can i still play the game?
When i say play the game, i mean barely - EXTREMELY barely...
What im getting at is, wouldnt the card stop working altogether, and wouldnt there be a way to get rid of the artifacting?
If another person tells me my card is knackered then ill submit, cry, and cry some more...