What motherboard?
Motherboard is GIGABYTE GA-MA785GT-UD3H fairly old. I had a more uptodate revision one that was AMD+ that does support them but finding this board seems it dont support when in device manager it shows them as their but with a hazard sign on the cards referring to error code 43 saying that hardware is fault but works with older gpu just the 480 cards it does not.
Thx for comments anyway for ones who tried 
If it comes to me I'll post it.... You could also try another card that you have already verified...wait...neurons are firing and crackling & something's coming back (amazing feat at my age)....check out your system devices and make sure all of those look right...specifically check your PCI bus driver to make sure the AMD drivers are correctly installed...also take a look at your AMD SmBus drivers...some of these you might try uninstalling (not permanently) and manually updating...I'm fairly certain that it was one of these drivers being incorrectly installed that was the fault of my code 43 error...You might want to play around with them all just to see...