sounds like a PSU issue. I have a Corsair C600M with 552W of 12V power and it ran an overclocked antminer without problems. However, not all power supplies can push full capacity for 24/7 and some may not be able to hold more than 80% of the peak rating for a long time.
Try disconnecting power from the secondary blade and try again. If the device runs 90GH without problems but is having issues with running both blades then its a PSU issue
I have a Corsair 500 CXM lined up for one Antminer. I read at over clocked they pull 400w. Will this PSU be good enough?
The Corsair CX500M, according to
NewEgg, has the following specs:
ATX12V v2.3
Modular
80 PLUS BRONZE Certified
100 - 240 V 47 - 63 Hz
+3.3V@25A, +5V@20A, +12V@38A,
-12V@0.8A, +5VSB@3A
12v x 38A = 456W
401W is 88% of the 456W, so I would not overclock the S1 using this PS.
EDIT NOTE: klondike_bar was faster than I was in posting. Same conclusion though.