multi PSU influence mining rig stability ?

[Valmara]

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 ?

[halker2010]

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.

[jmigdlc99]

What do you mean when you say:

I will get the red GPU is giving errors message

The first step of course would be to read into the error message. What exactly does it say?

Regardless, as the previous poster mentioned, your problem could be not related to your PSU. It could be a faulty GPU or poor overclock or undervolting settings. Many people including myself have run rigs with multi PSU configurations without problems (for days, months, even years).