Dual mine forbidden with AES and Cryptonight Heavy.
AES because it's always far worse than regular threads, Heavy because there's no longer smooth parts in cryptonight version Heavy, so threads have no longer any resource to share.
Dual is for non-aes, C-Night[v7], C-Light[v7], 32 or 64 bits.
I was aware of that fact, I tried because my CPU have 16 cores 8 physical 8 logical, if we use for example 4 each the flood cache happens, hash drops, so I thought if the logical shares the phisical core cache maybe it will work, was just a guess no technological knowlage.