for the last 24 hours the difficulty is so high that it makes pointless any Eth mining.... I'm mining with 2x160 MH and received 0.1 ETH... wtf

'she wanted people to know' .... right, now I believe you

I'm with AMD Rigs and also without these lines 

check if your phone OS has some sort of process optimizations and then exclude the app from killing cycles

Check your power management policy (Start -> Run -> powercfg.cpl) and make sure that PCIE Link State Power Management is disabled (Off)

Hmm, I wouldn't be so sure that a PCI-E port is broken. Especially if it's your first 16x one. Try not using different cards, but only one for which you are sure it is performing well on another PCI-E port. Then start narrowing down the possible reasons - Riser, Riser cable, don't overclock the card -> test in 2 different ports with the same Riser.

I guess you meant memory overclock, not underclock. After trying a number of different tools, at the end Claymore -mvddc isn't working for me so I'm using Afterburner. For the moment core underclock and memory overclock is being auto applied properly on every reboot.

I have the same MB, CPU but mining with 6x470s
From the  GPU-Z screen, I'd say something is wrong with the OC - some of the cards are running with default voltage. Also wondering how your GPU3 is using significantly less watts (almost impossible).....