Re: 30Kw a rack?
Quick google gives these estimates:
* 38 Petaflops and 3.2PB of RAM (2010)
https://www.wired.com/2010/08/reverse-engineering-brain-kurzweil/
* Similar for a cat-like brain in real time (2010)
http://www.strategicbusinessinsights.com/about/featured/2010/2010-06-aicontroversy.shtml#.WQmoilPyt_8
* 1 Exaflop (2012)
https://singularityhub.com/2012/11/01/the-race-to-a-billion-billion-operations-per-second-an-exaflop-by-2018/
A Xeon chip can do "more than half a teraflop" when running the right instructions:
https://www.microway.com/knowledge-center-articles/detailed-specifications-intel-xeon-e5-2600v3-haswell-ep-processors/
So your rack of 600 processors might be roughly 0.3 PFlops. You'll need somewhere between 125 and 3300 racks, consuming from 6MW to over 400MW.
Frankly, I'd be surprised if it hasn't been done already somewhere.
Furthermore, once research has demonstrated what the best algorithm is for simulating a human brain, then you can build custom silicon to do the grunt work, which should be substantially more efficient.