Quote from: Valmara on November 01, 2017, 07:24:27 PM

I have been mining for 2 months now and i started to run into stability issues.
1 of the things is that i can now only run 2x R9 390's because when i add another one or a 7750 the system will crash within hours.

I will get the red GPU is giving errors message.
When i pull the extra R9 and the 7750 it can run for a full week without issues. This dramaticly reduces hashing power and my ROI.

Okay, i have been using an OCZ 700W psu together with a 500W psu. Tried a 1400W psu instead of the 500W but got the same results.
Troubleshooting is a bitch at this point.

My question:

Is it mandatory for all cards to receive the bus power (through Sata conector) from the mainboard PSU or doesn't that matter ?

I use a 1200 W PSU and 850 W one for my 1070 rig right now and there hasn't been any issues altho one of my Green PSU main motherboard cable melted few months ago and right now i use fans next to wiring in mainboard,
for your issue i say if you think it is indeed a PSU issue try checking with a wattman to see if you max out your current powers.