how do i safely overclock r9 390 to 1100mhz?

Frazman2001

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Feb 2, 2015
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i overclocked my XFX r9 390 to 1100mhz and 30% power limit, but on firestrike i was getting strange screen glitches, like white patches, and my gpu temps where at 85C. How do i get the same overclock without these glitches? Thanks