Also - why are the batch3's a tad more expensive than the batch-2's?
Batch 3 is 4.86 TH/s @ 600 MHz and Batch 2 is 4.66 TH/s @ 575 MHz. 200 GH/s difference and 1160 watts for Batch 2 verses 1210 watts for Batch 1 and 3. They are both still 0.25 watts per GH
I believe the batch 2 are batch 1 rejects. They were not mining to specifications they laid out for Batch 1. However, they should work fine at 575 MHz instead of the 600 MHz originally quoted for Batch 1.
If it was so, then it is not clear why batch 2 was not sent at the same time as the remainder of batch 1.
Just policy?