PSU wattage for 3x GTX 1080 Ti + AMD Threadripper 1950X
Would a good 1200W be enough or is it even too much?
AMD 1950X has TDP of 180W, one GTX 1080 Ti has TDP of 250W, add all together and you're looking towards 930W. Add the rest of the system to it at about 170W and total peak power consumption would be 1100W.
While your system does run with 1.2kW PSU, if you OC your CPU/GPUs, system consumes more power and just to be safe, go with 1.5kW PSU, e.g Corsair AX1500i,