Since the release of version 0.22.1 on 20th of September, T-Rex now includes a mode that tries to partially lift the limitations of mining using Ethash and Etchash algorithm on Low Hash Rate (LHR) GPUs.
Since the release of version 0.24.0 on 7th of October, and 0.24.1 on 10th of October, the miner now also includes a dual-mining mode, a low-power mode for LHR unlocks, has changed the tuning parameter, although previous ones are still converted to the new percentage-based value, automatically detects and tries to unlock LHR-affected GPUs even with no lhr-tune value set, and will attempt to increase the performance if not triggering lock for a prolonged period of time.
Since the cards are LHR series, the hashrate is limited in some of the algorithms. The locked cards are in some cases able to achieve higher performance when mining two separate coins instead of the same locked one. This is done by having separate algorithms, separate pools and separate wallet addresses (in most cases), and the performance can be higher than during mining only with one of the locked algorithms, like Ethash or Autolykos2.
The implementation available in T-Rex in particular allows users to mine ETH at 30% the theoretical non-locked hashrate and 70% of the non-locked hashrate of another coin, like RVN with KAWPOW algorithm, CFX with Octopus or ERGO with Autolykos2. Please note that hashrate might be limited during ERGO mining too, so it might be worth trying to experiment with another algorithm if ETH+ERGO dual-mining slows down too.
Here are the config examples and how-to-setup for these dual-mining modes:
Since the cards are LHR series, the hashrate is limited in some of the algorithms. The booster, also called an "unlock" of peformance is attempting to run the cards at hashrates higher than the lock allows, but below the speed at which the locking mechanism will "notice" the "violation" and attempt to lock the performance.
Think of it as a gray zone between the target allowed by the drivers and the point where sensitivy starts, zone in which you're still not limited, but if you go a bit higher than that — you'll be forced down by a lot.
The booster also has a mechanism to counterplay the locking: if the miner detects hashrate going down significantly, it will pause mining on the GPU to "reset" it and attempt to run at a bit lower tune in order to not trigger the locking mechanism again.
During this process the reported hashrate will fluctuate and mostly stay on the lower side because every LHR lock will cause the miner to pause for 20 seconds to unlock the GPU, so you may need to wait till it finds stable settings.
, "lhr-tune": "4" }
0- disabled (use for non-LHR cards)
1- lowest hashrate, low chance of LHR lock
4- recommended starting value for most LHR cards
8- highest hashrate, high chance of LHR lock
-1for automatic behavior and 0 to disable LHR detection for the card to 100 for the max hashrate possible. The starting value recommended for regular mode is
}at the end of the config with
, "lhr-low-power": true, "lhr-tune": "-1"}
, "lhr-autotune-mode": "off" }
, "lhr-tune": "80" }
0- disabled (use for non-LHR cards, or the ones that aren't affected by LHR under the overclock you use)
99- For cards with GDDR6X memory (3070Ti, 3080, 3080Ti)
91- good starting point for GPUs with GDDR6 non-Hynix memory
80- GPUs with GDDR6 Hynix memory, these aren't working well with the unlocker, so you may need to try even lower setting
Instead of value 4 in the given example, you can set different value for each of the GPUs. For example,
"lhr-tune": "0,0,4,0" will not enable the booster for cards 0, 1 and 3, but will enable for the card #2 at the starting value.
Here's a full example config with the tune configured:
On windows-based systems, you manually need to install drivers for cards. The cards have been tested to work with driver version 471.68 and you can find other versions on Nvidia's official driver search.
You can use the new versions of msOS to use the LHR series cards with new driver version included, available on msOS Version Archive. For most motherboards msOS version 1.4.10+ should work, but if your system requires newer kernel (mostly for newer motherboards, like H510 Pro BTC+), you can use msOS version 1.7.5+.
If you are already using an older version and would prefer to not reinstall OS completely, while adding LHR Nvidia GPUs to your system, and they turn out to be not detected on msOS, update drivers with
nvidia-update --install 470.63.01
Driver updating details are also available here.
If after driver update and reboot, your GPUs are still not detected, then re-check BIOS settings:
On msOS side, you can try this command:
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