For the tbm miner it's usually enough to limit the tdp to 70% or 60% but you can lock clocks as well.

--lock-cclock [1200,1200]

3 cards:

--lock-cclock [[1250,1250],[1250,1250],[1250,1250]]

you can unlocknindividual cards with

--lhr-unlock [0,0,1,1,0]

use a higher value for more agressive unlock, or negative for less agressive