They've gone from 0.4w/GH to 0.67w/GH which significantly impacts both the running costs AND the length of time these will be viable to run.
There was never a 0.4w/GH for the full system. 0.5W/GH was what I used for my calculations and I am sure that downclocking will be possible just like with SP10.
6TH, 2500w is what it says, but using Guy's figure of 2700w that's still 0.45w/GH -> 0.67w/GH which is a 40% increase.
This affects the running costs, profitability and lifetime of the machine, and should also be considered when deciding compensation.
And all hosting quotes we got are for 2500W and no one saus a word to say it was 2700W (even hashplex hash SP30 listed as 2500W
Another problem could be pushing the PSUs to that limit, being server grade is not the same as "unlimited powa" a 10% over specs sounds risky so I hope the FW is on the safe zone to avoid burning the PSUs