Nvidia GPU mining ETH low hashrate? LHR in cause? Unlocked miner not working? This may help you!

I own a home server. A small server with a lot of old Hard disk drive, in a raid 0 configuration. On this server I have 2 PCIe x16 slots, so I added 2 GPU. 

At my local computer store, I got 2 MSI Nvidia RTX 3060 ventus2x for a decent price. I wanted to use this rig to mine ethereum. When I started T-Rex miner, the stats were less than half the hashing speed I was expecting from my search on the net. I got only 21 MH/s and on the net I have seen these cards could do 48 MH/s. It is only then that I learned the existence of the LHR (Low Hashing Rate) feature in the Nvidia 30XX family. No it is not advertised clearly... 

 This feature is the response from Nvidia to miner that are the cause of the price increase and the unavailability of the GPU these years. By using the same power amount, but with a cutted in half hashing speed these cards are for gamers and 3d artists and other non miner use. From what I have learned, the LHR is only against Eth. In response to the LHR, some miners software like lolminer, t-rex... found a way to unlock the LHR, but not to 100%. In my case, 21 MH/s is more than half the 48 MH/s, clearly the LHR unlock is not working. Searching the net, I found the nvidia driver version 470.05 has the LHR disabled (for some older cards). 

The driver is only available for windows and I was not able to make it work with my hardware. Continuing my research, I found that since the NVidia driver version 512.95 the miner LHR unlocker were not working! So, for windows using the driver version 512.77 is working great for mining, getting 42 MH/s without playing with the GPU. 

Same for linux, using the version 510.73 gives the same result with t-rex miner. Sources: https://www.nicehash.com/blog/post/psa-full-lhr-unlock-does-not-work-with-nvidia-512-95-driver
https://www.nvidia.com/Download/driverResults.aspx/189809/en-us/