It IS insane if you are considering prolonged use at that power level. But if you are only looking at bursty workload that last for a few seconds here and there, think Photoshop, then the power spikes aren't a huge concern. Then again it's easy to cap the power at more sane levels with only a small decrease in performance. But yes I'm certainly not going to compress video for hours on end at 350W!I am dying to see how that compares to a retail 7950x, but in 9 days we should know. That will save arguments.
But I must says, 42% boost for 45% more power and 343 watts total seems insane. How would you cool that ? AIO are only 250 watt I think. Custom WC only ?
As you wrote we'll know more in 9 days.