Quote from: beIbox on December 11, 2016, 10:27:15 AM

Quote from: mettalmag on December 11, 2016, 10:10:07 AM

Quote from: beIbox on December 11, 2016, 09:46:22 AM

Quote from: TimLev on December 11, 2016, 09:35:18 AM

@Claymore

Rig 6xR9 390 1150/1500

v.1.0 - v.8.0 - 0 crashes for all the time.

v.9.0/9.1 crashes each 10-15 min, various GPUs. (any -i value)

Something is wrong with this version.
Rollback on v.8 returns stability.

Again and again.
Problems can be:
1. PSU wattage load
2. PSU ripple suppression
3. PSU voltage regulation at different load variations
4. Bad risers and other cables. (Least likely if still working in other versions)
5. Incorrectly configuring windows

can you please expand 2 and 5

2. Ripple is a phenomenon that occurs with all SMPSUs (switch-mode power supply units). It is the tiny fluctuations in a power supply's output voltage, on the order of tens of milivolts, millions of times a second. It is an artifact of the process of converting a sine wave AC input to a constant DC output.

Ripple is measured as a peak-to-peak value in milivolts, and is measured using an oscilloscope (software can not detect ripple, nor can a multimeter or voltmeter; you need an oscilloscope with a scanning frequency of at least 30MHz). The ATX specification sets these limits on computer PSU ripple levels:

+12V - 120mV
+5V - 50mV
+3.3V - 50mV
+5VSB - 120mV
-12 - 120mV

Why is having good ripple suppression important? The first reason is hardware lifespan. Ripple wears on several types of electrical component, the most relevant being electrolytic capacitors. The closer ripple levels are to a capacitor's rated ripple, the shorter its lifetime will be, and ripple exceeding its rated level can cause it to blow or perform poorly. Since electrolytic capacitors are found in your power supply, motherboard, graphics card, and many other components, having a power supply with good ripple suppression is a must for long-term reliability.

Another problem poor ripple levels can cause is one that will surely strike fear into the heart of every overclocking enthusiast. Higher ripple levels means lower overclock.

5. A lot off factors. You must check power settings first, turn off PCI-E power control.

that explains a lot, our hardware importer bought these for our 3x RX480 8G mining rigs http://www.zalman.com/contents/products/view.html?no=96
for last few days most rigs work without any issues, after V9 some of them had problems (maybe 3-4 out of 95) but after playing around with clocks mems voltage everything is stable now so far so good

Quote from: adamvp on December 11, 2016, 10:38:05 AM

Have coinmine.pl support lowered devfee?

I heard they are stealing shares, thinking to switch to dwarfpool