Thanks cryptoillusion1, have edited it.
Re: lowering the clocks, although this will lower the power consumption it still won't address the issue that at the same clocks it is consuming more power than usual ie lower clocks will be consuming same power as the higher clocks were.
The other issue is that the original GPU 0 will only work in the 16x PCI-e slot if connected to any of the PCI-e 1x slots it fails to get picked up.
I was wondering if the clock and settings have not changed from when you altered them - these are stored in the registry and may not have changed
Why don't you reset all the settings to the bios settings
To do this you could open radeon settings and in global settings 'reset' each card and try
GPU not getting picked up- Try (1) install another gpu on 16x -gpu0 not connected - restart (2) switch computer off- install gpu0 on 1x - start computer
if above does not help- reinstall driver