Can i overclock gpu and cpu using this motherboard

Ateeb345

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Apr 21, 2014
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I wanted to know that can I over clock i5 4670k and my GPU which is going to be r9 280x or gtx 770 can't decided yet by using as rock fatal1ty killer z87.

also wanted to know that if sli gtx 770 2gb version then its cram is going to be doubled or not.... plz suggest a cheap PSU keeping sli and xfire in mind thanks........
thanks...
 
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