Most of us are mining ETH and we only OC the memory not the core clock.
And there is no such thing as Memory Asic quality.
I am actually switching around to different algos depending on profitability and testing purposes. My friends also mine multiple other algos, mostly Monero. I understand that you may mine Ethereum specifically, but there are others who mine different algos. This was more of an attempt to gather information for future use. Ethereum is supposed to go Proof-Of-Stake in the future, resulting in many miners looking to mine other coins from Ethereum.