Sapphire Nitro+ 5700 XT and Red Devil 580 GPUs are the best ones I had experience with since last 4 years of mining. They both are very silent and mined for 2 years non stop. I stopped using them since ethereum merge. They only were used with phoenix miner
The Radeon 5700 XT has been on sale since September 2019, and for the first 4 months or a little more, the hashrate was minimal, because the miners did not optimize their software. Then there were many models with poor cooling, which caused overheating of video cards. You probably bought the most expensive models with the best cooling.