It is soooo bad it must be written in error.  I say just don't buy it and I think it will be corrected after the Chinese holidays.

 v3 price   .666                    v4 price 1.00
v3 interest 0.8        v4 interest 0.45  

so interest drops from .8 to .45  the contracts are based on  s-5 power use and a 120 day limit.

the v3 will need 95-110 days to pay off and that is paying off .666  most of us will be paid off in 60 days or less from now


the v4 will need 135-160 days to pay off with 0-2% diff growth.
  at 120 days they may no longer earn based on s-5 power.

So even though the interest is better ( I could be wrong and missed by a decimal)  you really run the risk of the contract getting shut down after day 120.

I was wrong interest is .45  I quoted old v3 below.

If the s-4 was based on s-7 power use it would be good.  I have to think they meant s-7 power use not s-5.

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You're right I really hope that they adjust that to the S7 but I'm not taking the chance on that.