ehabash1

AHowes
1300watts or feel safe with a 1600watt evga monster.

Thats disappointing. I JUST purchased a EVGA SuperNOVA 1200 P2. With that said, assuming max draw with Heavy OC is something like 425-450 watts.  Thats 850-900 watts. A platinum 1200 psu should be fine. 1.425 volts gamersnexus 9900k 5.3 ghz oc live on asus maximus was pulling about 270+ watts
Hmm, it will be tight

1200W is plenty of power for single card or even an SLI rig air or water cooled.
You guys are going to hit the power limits/temperature throttling long before you run out of power.
 
I was benching a 9980XE at 5.7GHz and 2x 2080 Ti Lightings on LN2 on a single 1250 Enermax.
It was good up to 1.2V on both GPU's (~2300MHz) before it would trip.  I've since added a 2nd PSU for benching purposes. :D