I have a question ...
i Have a rig with only 8gpu on it .. still have 4 slot empty .. can i had 4x Acorn CLE 101 on the empty slot and get 60% more hashrate on ethash with my rx 580 8gb ? or 1 maximum by rig ?
No
Edit you need a m.2 slot not a pcie slot.
The m.2 slot needs 16 lanes not 4.
If you use a pcie slot you need an adapter to fit the acorn.
And the slot must support 16 lanes.