I think more info is needed. What case? Watercooling anything? Fans? Ocing going on?
It does seem a bit high 4 a 580 but not 2 excessive as it's under load.
Perhaps the air flow is restricted 4 good case cooling. To drop the temps on my old case I simply replaced
the stock fans with higher cfm fans and it resulted in approx. 6c drop.
If the gpu's air flow dumps heat into the case interior that'll help. Adding a fan behind the gpu helps. I
removed 2 expansion slot blades and covered the opening with nylon pieces to prevent anything from
entering, especially pet hair as we have 2 dogs and this dropped the temps all around a fair bit as well.
Hope this helps, and good luck!
