Do I need a Bigger PSU?

dcunited

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Feb 12, 2015
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I was wondering if I need a bigger PSU for this build.

i5-4690k overclock to 4.5ghz
Asus Z97-A
MSI GTX 970
MSI GTX 970 (SLI)
650W PSU

Based on PSU calculators the entire build with extra components is 490W. This number does NOT account for over clocking. About how much extra wattage does over clocking the CPU use? Thanks!
 
Solution
Just for reference, in my experiences with overclocking, it's about a 10% additional draw from the PSU (CPU and GPU, and that is measured draw, not calculated.).