I am running both on 1 antec 1500 watt power supply.
Hi, i didn't find any antec 1500watt on antec product list.
The biggest capacity is HCP-1300 Platinum 1300 Watt
HCP-1300 Platinum have 4 rail with each rail rated at 50A(600watt max).
You need to make sure to spread the load from each blade to each rail.
Rail 1 for blade1 miner1,
Rail 2 for blade2 miner1,
Rail 3 for blade1 miner2,
Rail 4 for blade2 miner2
as he says antec has no current 1500 watt model and antec has split rail systems (bad easy to overload 1 rail)
Please give use the exact model number of your antec so we can determine how many rails it has.
An easy way to see if this is the case is look at the label 4 rails . My suggestion is down clock the gear to 1050gh vs 1150 gh see what happens. Also figure out your rails.
http://www.jonnyguru.com/modules/NDReviews/images/AntecHCP1300/DSC_4610.jpg