The day has finally come. 100% FULL LHR UNLOCK is here.
NiceHash was the first to release open-source software to fully unlock Nvidia 30 series cards.
Shortly after, other mining software such as NBMiner updated their software to include the full LHR unlock.
The Previous Unlocks:
The previous unlocks would jump between clocks to help prevent the tripping of the LHR driver and would average the hash rate out. The jumping between clocks or changing the GPU load would help trick the GPU into thinking it wasn’t mining a crypto algorithm. Many developers spent a lot of time fine tuning this to find the best mix between high hash rate and low hash rate points to get a better average using counters. These counters would tick down and dictate at what speeds the cards were mining at.
What was discovered:
In the leaked portion of the drivers it was discovered that the internal parameters such as how much memory access can we have and how much can we mine were hard coded into the drivers. This LHR controller was put in place like many other Nvidia controllers that are inside of the drivers like the controller for thermal throttling. These controllers have certain routines that they follow to override the base driver and make changes based on the data they were monitoring. However if these default parameters were changed the Nvidia driver would just hang. But if the default values were sent back to the driver then the LHR countdown would not start. The GPU sees everything as normal and just carries on. So if we are mining and then call the Nvidia driver using the default parameters then the counter essentially resets and the lock never gets put into place.
The Simple Breakdown:
The LHR control module is looking for patterns in the memory being accessed. When it starts to notice a pattern similar to ETH then it starts a countdown. Once this countdown hits 0 the LHR controller function gets put into place and then limits the memory access. If the values inside of the driver were changed then the driver would hang and do absolutely nothing. However if the same default values for the GPU were sent back to the driver then the counter would reset.
It was only a matter of time before this was released, and it is great to see the crypto community sharing open-sourced software like this. When it would have been easy for NiceHash to keep it all for themselves. At least for as long as they could.
If you are a miner with an LHR card, simply download the latest version of your mining software – or make the switch to T-Rex since it is great for 30 series cards.
Our Ethereum Classic Mining Pool is fully compatible with NBMiner, T-Rex, and all other mining software, and would love to have you’re fully unlocked GPUs join.
Happy mining everyone!