Background: This machine is a clone of another that is working 100%. It is 6x RX 480 Sapphire Nitro+

V7: 1x card working at HALF strength
V8: 1x card NOT working at all.
v9: 1x card working at TREBLE! strength

For some reason, one of the cards is working at ~650 Sol/s !!
I have restarted the machine multiple times while adjusting overclocks, remove overclocks, underclocking etc and this card still has numbers exceeding 600...

... the downside: lots and lots of REJECTED SHARES. 30%+

http://imgur.com/a/1FiDu

(The value's to the right are the ASIC scores. This is one of my 'in-the-middle' machines)

Any recommendations, solutions, suggestions?

Pre-emptively; the riser has been replaced multiple times, each with new risers to make sure one I didn't swap in a dud.



FYI: Each of my RX 480's are between 228-235 sol/s. Each machine is on average 1.380 KSol/s