Tasos train your memory at 2400 8-12-8 then reboot set mem multi at 2600 with fast boot enable...
that should do the trick,
Also for me black slots work amazingly good,orange ones not so good...
All our runs had that high nature (ok more than 1780)so it cannot be buggy... nature is trickier than the rest... also catalyst settings help but not in the CCC... the same thing goes about the efficiency in unigine...