Is it safe to buy GPU used for mining?
All in all, there are absolutely no major downsides to buying a GPU that was used for mining. Just make sure you do your due diligence to research a couple of things when buying any kind of second hand GPU - the warranty period, the usage period and any kind of quirks present in the second hand GPU.
What is the best way to buy GPU for mining?
The most important factor of any GPU for crypto mining is efficiency — you want a high hash rate for as little electricity as possible. Take our highest recommendation here, for example. It's the NVIDIA GeForce 3060 Ti, an incredible GPU for gaming, but it's also excellent for crypto mining.
Are miners selling their GPUs?
Crypto-miners are shutting off their rigs and mulling selling their GPUs since few, if any, cryptocurrencies are currently profitable if you try to mine them, following the Ethereum merge.