Fact: PCIe 16x on Motherboard will supply max 75 Watts, PCIe 1x on Mobo will supply max 55 Watts. Molex connector will supply max 75 Watts to riser and SATA connector will supply max 55 Watts.
So, if we are using Molex connector, will be same as put it directly to 16x PCIe on the Mobo. But am not really sure if the USB cable that connects a PCIe to Mobo using PCIe 1x in front and USB at the end, would supply 25 Watts or not. If yes, 50-55 Watts from SATA + 25 Watts from PCIe 1x to USB would be enough to supplying power to the riser.
-2nd-
That's also the method I always use, safer. The setup process will load faster when we put our cards one by one.
Thanks for the info Jill! Swapping to the Molex connectors definitely solved our issues. At full power of 117% on the 1080ti, it was pulling 311 watts, and now at 100% it only pulls 277 watts. The 1080 FE cards were pulling 195 watts at 120%, and now at 100% are pulling 178 watts. Also, we had the core clock on the 1080ti at around +99mhz but had issues and had to drop it down to around +60mhz for stability. It still sees over 2000mhz at some points. Our 1080 FE cards were at +250mhz, but were causing ccminer to crash after a while on certain algorithms, so we chose to back them down to +212mhz and haven't had any issues at all since. The 1080's see as high as 2050mhz sometimes.
EDIT: We later backed the cards all down to 90% to help with the heat in my office. They still hash at close to the same hash rate as before.
I have found 117% 100% settings to be not very practical .
90% is better then the 2 above.
I prefer 70-80% myself