KEN wrote:Also, tell me about your PSU. It's most important. Tell me exactly which one you have, make and model. Maybe it's not powerfull enough to power 2 cards.
If PSU is not powerful enough, it will burn, that simple. Sometimes you can put more load onto PSU than it gives out, if it has good cooling, it just gets quite hot, but won't burn. I put GTX550Ti into my single core PC that has like 350w PSU and it worked fine (It didn't even have PCI-E power, so i used MOLEX to PCI-E), it was under load for about 3-4 months, PSU was running quite hot, but so far still works.