Asus b250 ME - it’s headache motherboard itself and with ccminer your trouble is double.
First of all you must play around PCI-E speed (Gen2 - is prefer but sometimes other values you can try. Also notice bus speed for this MB you can meet and change in different places for x16 slot and x1 slots respectively !)
After setup PCI-E bus speed toy can play with intensity
Thanks for @paulw for research http://forum.hiveos.farm/discussion/comment/3997/#Comment_3997
After several days of trying, I have finally fixed all the issues I have been facing. Now, hashrates are stable and no more weird power usage on GPU#0.
Thought I should share this. For the benefit of all Asus B250 Mining Expert motherboard users, not only must you switch PCIe to gen2 which I did, you have to switch x16 slot PCIe to gen2 as well. <-- I was totally not aware of this earlier because they are on two different pages in the BIOS setup! See below,
Advanced>PCH Configuration>PCI Express Configuration>PCIe Speed>Gen2
Advanced>System Agent (SA) Configuration>PEG Port Configuration>PCIEX16_1 Link Speed>Gen2
Hope this helps some Asus B250 Mining Expert motherboard users.
other similar mining boards also this can help