PSU for dual 3090s?

[arconz]

My new rig will have a single RTX 3090, Ryzen 5900X, a couple NVME drives & a large custom water loop.

However its possible I could add a second 3090 at some point so I used 2 cards with the online PSU calculator. It showed a load wattage of 968W so recommended a 1,200W PSU. Is this enough for dual 3090s i.e. does it take into account the power spikes I've heard about these cards?

 

[arconz]

Will you be overclocking? Because I'm not sure how much headroom you'll have. It might be more prudent to plan for having two PSUs.

No overclocking. Case will be the Fractal Meshify 2 XL, don't think it can take 2 PSUs.