The hum of thousands of GPUs running 24/7. Electricity bills that could fund a small business. And then, one September day in 2022, silence. The ethereum miner became a relic almost overnight, swallowed by a chain-wide upgrade that rewrote the rules of the network. But what exactly did these miners do, how did they make money, and is there anything left for them now?

What an Ethereum Miner Actually Did

Before The Merge, ethereum ran on a consensus mechanism called Proof of Work (PoW). In simple terms, miners were the network's referees and bookkeepers rolled into one. They used specialized hardware to solve cryptographic puzzles, and in return, they earned freshly minted ETH plus transaction fees.

The puzzle-solving algorithm Ethereum used was called Ethash. It was deliberately designed to be memory-hard, which meant it favored GPUs over the ASIC chips that dominate Bitcoin mining. This was a philosophical choice by Vitalik Buterin and the early devs: they wanted mining to stay accessible to hobbyists, not locked behind industrial-scale operations.

Every miner bundled up pending transactions, raced to produce a valid block, and broadcast it to the network. The winner got the reward, and the chain grew by one block roughly every 12 to 15 seconds.

Hardware and Software: Building an ETH Rig

If you wanted to be a serious ethereum miner back in the day, you needed three things: power, GPUs, and a setup that could survive the heat.

The GPU Question

For years, the gold-standard cards were NVIDIA's RTX 3060 Ti, 3070, 3080, and AMD's RX 5700 XT and 6800 XT. Hashrates varied, but a well-tuned rig of six to eight high-end GPUs could pull between 250 and 400 MH/s combined. Profitability calculators like WhatToMine were practically a second homepage for anyone in the space.

Beyond the GPUs

  • Motherboard: Mining boards with multiple PCIe slots, often risers, to connect everything.
  • PSU: A reliable 80+ Gold power supply, often 1000W or higher, because GPUs under load are hungry.
  • Cooling and airflow: Mining farms in Texas, Kazakhstan, or Siberia weren't a meme — heat management was genuinely mission-critical.
  • Software: PhoenixMiner, T-Rex Miner, lolMiner, and Claymore (the OG). On the pool side, Ethermine, F2Pool, and SparkPool dominated.

The Profit Math: When Mining Made Sense

Mining profitability is the brutal triangle of hashrate, electricity cost, and ETH price. In 2020 and early 2021, all three aligned beautifully. ETH shot from under $200 to over $4,000. GPU shortages became so severe that NVIDIA briefly released "Lite Hash Rate" versions of its cards to discourage miners from buying them all up.

Then came the crash. The summer of 2022 saw ETH tumble below $1,000, hashrate stayed high, and many rigs started mining at a loss. Power in some regions cost more per kWh than miners earned in ETH. That was the backdrop for The Merge.

The transition from Proof of Work to Proof of Stake cut Ethereum's energy consumption by roughly 99.95% overnight. That's not a marketing claim — it's audited.

The Merge and What Happened to Ethereum Miners

On September 15, 2022, Ethereum switched to Proof of Stake (PoS). Validators replaced miners. Instead of burning electricity to solve puzzles, stakers lock up 32 ETH and vote on the state of the chain. The mining reward disappeared. So did the GPUs' reason to be there.

Some miners pivoted. A few pointed their rigs at Ethash-based forks like Ethereum Classic (ETC) or Ravencoin (RVN). Others sold their hardware to gamers or AI data centers — which, conveniently, were going through their own GPU shortage thanks to the generative AI boom. NVIDIA's stock, not coincidentally, kept climbing.

Can You Still Mine Ethereum Today?

Short answer: not on the main chain. The post-Merge Ethereum network does not produce blocks via mining. Anyone claiming you can "mine ETH" today is either running an outdated guide, scamming you, or referring to a testnet.

If you want exposure to ETH rewards without buying tokens outright, the modern equivalent is staking. Solo staking requires 32 ETH and a dedicated node. For smaller holders, liquid staking protocols like Lido, Rocket Pool, or centralized exchange offerings let you stake fractions of an ETH and earn yield in the 3–5% range, depending on network conditions.

Key Takeaways

  • An ethereum miner once secured the network using GPUs running the Ethash algorithm under Proof of Work.
  • Profitability depended on GPU hashrate, electricity cost, and the price of ETH — all three had to line up.
  • The Merge in September 2022 ended ETH mining entirely, slashing Ethereum's energy use by over 99%.
  • Former ETH miners mostly pivoted to altcoins, sold GPUs to AI buyers, or exited the space.
  • Today, the closest equivalent to mining ETH is staking — locking tokens to validate transactions and earn rewards.