I do not know what problems you have with AMD video cards, but the 6600-6800 series are very good video cards and are cold.
Also there were no serious problems with the 5500-5700 series, the 5700 series had problems with overheating due to poor cooling from some manufacturers. But AMD does not make LHR video cards
Is non LHR GPUs that scarce because I can get them with ease in my country, I have a supplier in Dhabi UAE who always send me non LHR 3060ti and 3070s, if you want them you can get them just find a supplier that know the difference, even on china market some sellers will use tag 'non LHR and LHR' on the GPUs
In fact, this is a very big problem, because new non-LHR video cards have not been produced for about 6 months.
You need to wait for delivery, which can take up to 45 days due to the complexity of customs around the world.
The most important point is that Ethereum mining ends.
Buying non-LHR video cards for mining Ethereum classic is a dubious idea.
I do not know what problems you have with AMD video cards, but the 6600-6800 series are very good video cards and are cold.
Also there were no serious problems with the 5500-5700 series, the 5700 series had problems with overheating due to poor cooling from some manufacturers.
I had always problems with dual miners like Phoenix,Lolminer and Gminer to name a few.Once I switched to specific AMD miner like Team Red Miner and T-Rex for Nvidia cards they are running for almost one week right now without a single restart.I had always crashes before with the other miners,I received advise here in other threads that I had a bad config or to much overclock,none of which is true when using specific miners.So this thread is made to tell people with RX 6800 XT that are having problems in multi rigs with different Nvidia cards,to try to instances of miners,one for AMD and one for Nvidia,this will solve many problems,just as mine is solved after many months of only crashing every 2-3 days.
Yes they are perfectly cold like 36-40 degree temperature and near 55 Memory temp now in Winter,so they are really worth the price in this matter because the cooler they run the longer they run.
@Rickirs
Tried both,MSI and Wattman of Radeon Software,both crashed in other miners.No crashes here with MSI afterburner so far.
You got a good experience, I think that in the future you will collect mining farms from the same video cards in order to avoid problems.