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Well you dont have the artifacts all the time so i am not sure if the card is really damaged.
Take a close look at the cards heatsink and make sure it touches the GPU and all the memory chips. I know the temperature reported look fine but there obviously arent sensor everywhere on the card - and they often cant be trusted anyways. Maybe one of the memory chips doesnt have contact and overheats - then produces the artifacts.
Dont change (or take off) the heatsink though if you still have warranty on the card - as this usually voids it.
Just to see if there might be an overheating problem somewhere take a big housefan and let it blow into the open case - play your games and see if the situation changes.
Have you tried slowing down your AGP to 4x and turning fastwrites off in the BIOS ? Unlikely this will help but its worth a try.
Last - is your power supply sufficient enough for your components ? Maybe after a certain ammount of time of running under full load it doesnt supply enough or clean enough power to your components anymore - and creates these problems.
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