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I need some help in OC'ing my R9 290X

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Hey
i'ts me again.
Today I stumbled upon this.
http://www.hardwarecanucks.com/foru...491-sapphire-r9-290-vapor-x-oc-review-10.html
First, this is simply mind blowing|
If the little 290 can achieve that high numbers, surely my own 290x can too. (Same cooler).
What concerns me is wattage.
They pushed 200mv trough the card and I have only 860 watts.
Should i not risk pushing to 1200 on the core with my current PSU?
 
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Little problem.
MSI AB only allows me to overvolt by 100 mv.
Sapphire's trix allow me to overvolt by200, but lacks a power limit option....
 
No good. it is stable at 1200mhz but temps reached 81°c
and this is after 15 minutes of Shadow of mordor at ultra settings....
 
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