T-Rex has partial LHR unlocking capabilities for 30xx ethash GPU mining (~ 70% of full hashrate).
To enable LHR mode, you need to explicitly tell the miner which GPUs are LHR and which are not. This is done by specifying the --lhr-tuneparameter which takes values from 0 to 8:
0- disabled (use for non-LHR cards)
1- lower hashrate, low chance of LHR blocking
4- Recommended starting value for most LHR cards
8- higher hashrate, high probability of LHR block
It can also be set separately for each GPU, for example --lhr-tune 0,0,4,0 - this will tell the miner that the third GPU is LHR and that it must start with the optimization value of 4, while the rest of the cards is not LHR.
The equivalent of HiveOS would be “lhr-tune”: “0,0,4,0”
It is important not to manually set the intensity values as this may interfere with the unlocking algorithm.
The miner will try to reach reasonable hashrate levels using the given settings and, if this is not possible, will start aiming lower. During this process the reported hashrate will fluctuate and stay mostly at the bottom because each LHR lock will cause the miner to pause for 20 seconds to unlock the GPU, so you may have to wait until it finds stable settings.
Do not change the overclock settings too much while the miner is running, especially beware of changes that could cause a rapid drop in hashrate, such as reducing memory overclocking or significantly lowering the power limit (all while mining) : this can fool the miner into thinking that the LHR has gone into action.
The 3060 rev.1 cards do not receive any special treatment and are best used with the 470.05 driver as before.