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1  Alternate cryptocurrencies / Mining (Altcoins) / Sparks flying.....need a diagnosis on: December 18, 2017, 12:41:20 AM
I have built 17 rigs successfully.......but this next rig....whoa.....what am I doing wrong?Huh  I have fireworks and dont know why?

its a 12 gpu 570rx rig.  I am using asus z270AR  motherboard.  I use all 7 pcie slots, both m.2 slots and a 3 card expansion board.
I have a coolmaster 1200 PSU hooked up with a evga1600  using a dual PSU adapter.
I have the first 4 cards, their risers,  expander board and motherboard on the coolermaster 1200 psu.  These first four cards run through the expander board.  The expander board is powered from a molex off the same power supply(1200 coolermaster).
i have the next 8 cards, and their risers on the 1600.
I start it up and POP with smoke and spark.  it was very loud and startling.  i unplugged quickly
The pop  came from a card that is plugged into the 1600 using a normal motherboard pcie slot.  There could be other damage.  I dont know. This card is powered by an 8 pin on top.  This 8pin strand also powers a 6pin riser on another card above it..... which is also on the same power supply.

What am I doing wrong??!?!?
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