That's nearly 5Th at under 2500 watts. Still speculation given that other factors have remained the same; ie. same number of chips per unit, etc.
A lot of calculations done pretty fast by the community. I don't think, however, Jupiter and Neptune can be compared so directly - we have no idea at what clock speeds the Neptune chips will run. Though I am almost certain it will not be the same clock as the Jupiters, so in essence we can't compare core-for-core performance.