Well I tried to setup my first ethereum mining rig.
I bought 6 second hands rx480 8GB (some on eBay, some elsewhere..) And these new parts:
-Z170 gaming K3
-Powered pci risers
-8GB DDR4 Crucial
-2x RMi750W PSU
-60GB SSD corsair
Well, I made the set up (cards, risers powered by sata/molex), I put 3 cards by PSU, installed win 10 and started mining on claymore.
I get a 1200W power consumption, and a 145mh/s speed which is good for me. Well, it mined for 40min and I got a blue screen "thread stuck in device driver" ..
Well I said to myself, it perhaps about windows so I installed Ubuntu and amdgpu-pro.. Well, same thing, 6 cards detected but I get a watchdog error "GPU2 Hangs in OpenCL call" or "GPU4 Hangs in OpenCL call" the miner try to reload but I get a frozen screen again..
Today I tried some switch between risers and PCIE slots I got the same error on same card (I identified the card with a 100% fanspeed settings on claymore)..
I tried to remove completely the GPU2 so 5 gpu mining but i get the "GPU4 Hangs in OpenCL call" error when I try this.
It work good with 4 cards only (even if the gpu4 is one of the 4 cards used). So I don't understand.. Could it be a PSU problem ? Not enough power ? It was a little bit more stable on windows I think.
I must specify -> I didn't overclocked the cards. Any help appreciated :)