Gtx 1060 some GPU won't "boost"

Hello,
I don' know why but i have 2 GPU who won't go in "boost" mod, look at the pic:


that gpu is under in term of gpu clock...


this one is ok.

someone have an idea ? i'm missing like 10-15% of performance for the GPU...

Thanks!

edit: these gpu who won't boost seem to be hotter than the others GPUs, don't know why but they have 5°c more than the other

1.Turn off SLI, disconnect it..
2. it looks like you have the cards locked/sync'd to each other, break it
3. try again