run cool during net surfing , temp be high 30 's to low 40 . YouTube flash player raise temp a bit to high 40 . I run this primary for flight sim x and xplane and do the job w\/o any problem . you can not not OC , but frankly you do not really need to . the trixx feature from Sapphire allow you to run core significantly faster than you would need . if this card be match properly with i7 processor , motherboard , and a good high resolution monitor , this card be a dream . its also stable .