You're right to look at ASICs if you're optimizing for hash rate and efficiency. After testing a few models, I settled on some high-end
asic hardware that gave me consistent returns without much noise or downtime. The key is to choose miners with high TH/s but also lower watt usage—some new-generation machines hit the sweet spot. Cooling is another big factor, so get ones with a solid fan system and external vent compatibility. I’d also suggest staying away from obscure brands—support and firmware updates matter in the long run. Having a few spare parts on hand helps reduce maintenance downtime too.