VRAM could be faulty, is the card still under warranty? You might need to RMA it back to the supplier/manufacturer.
I had the same thing recently with a brand new MSI R9 280x, I feel for you bro.
Yes it's under warranty as it's brand new. And I don't think it's running too hard or anything. 430 khs only at 65 degrees celcius (asus r9 270x)... How I can know which card it is? It's card 1 in cgminer...
And what can I say to the supplier? As I don't think they like if I said I use it for mining zeitcoins..
If it's card 1 then it will probably be the second card down (top card is usually card 0). Not sure about the supplier you went to, but mining on a GPU won't void your warranty so you should be fine returning it.
But before you return it, try turning it down a bit first. Drop intensity down by 1 for an hour and see what happens.
Ok intensity is now down by 1. My cards are now running 10 khs lower. The SICK and DEAD happened only once in 3 days. So should I wait another 3 days to see what happens? How can I only manage this GPU 1, not all of them as now all my cards are intensity 18, I only want this shit card to be 18
What does "R" mean in cgminer?
This sick card has R 32 but the other 2 cards are R 0? What dows that mean?
If you just want to lower one card by Intensity, I've found using CGWatcher as a CGMiner GUI handy and you can alter Intensity, clock speed and fan speed from within. Plus it's free! Search Google for CGWatcher and it'll be the top result.
Slightly off topic, has anyone used the CGRemote? I'm incredibly tempted to pay for the beta access if it's worth it and I can install on two machines for one donation.