Originally Posted by Ken1649
Great contribution, you have solved the OP's issue
I don't know if you are trolling or not, but just to clarify:
I'm testing my own R4E and 4x 580s.
Only connected one EPS power (the full 8), and did not connect the 6 pin PCIE power.
The CPU is currently clocked at 4.8ghz and the GPUs are at 850mhz.
Everything is working spot on.
I'm rebuilding everything over the next weekend and than will put everything under water.
The EZ_PLUG in the user guide, are not actually any type of a EZ_PLUG. There is no such thing. Its just a name.
The first, 4 pins, (see page 2-34 in the guide) is an old HDD plug (4 pin one you stick to a 1.44 drive), which is there to deliver extra power to the memory
The second, 6 pin, is a PCIE connector, and is there to deliver extra power to the PCIE lanes, in order to reduce the load from the main board power (75w per lane from motherboard to the cards).
On the R3E there was an extra power connector on each side for a 150w extra power (or 450w extra power if you also add the Xpander power inputs).
The UD9 has the same as the R3E, extra 150w.
There is no need to use the two extra power plugs, especially under stock. The motherboard is good enough to handle those things easily.