Hi. I have a NVIDIA GeForce GTX 580 and it has been recently getting pretty hot. The highest its gotten is 98 degrees. I'm not sure what is an unsafe temperature for this card, but I don't think it should be in the 80s and 90s. I think the fan on the card is going out as I started hearing a knocking sound coming from my computer and then it started running hot. The only games I play on this computer are World of Warcraft,Hearthstone, and Second Life. I don't believe any of those games are graphically intensive so I don't think the card should be heating up that badly. Is it time to get a new card? If so, should I go with 760 or 770?