GPU mining

• 1. Introduction

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  GPU mining was not possible the day Bitcoin first launched in early 2009. The first software capable of configuring graphics cards for mining arrived in October 2010. Those cards would later anchor a $15 billion purchasing surge and a global chip shortage. How does a component built for video games become the backbone of a financial network? Who built the industry, who paid its costs, and what ultimately brought it down?

• 2. The Proof-of-Work Engine

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  Bitcoin's network runs on a system called proof-of-work, requiring participants to perform computationally intensive calculations to verify transactions on an open ledger. Miners who complete that work receive cryptocurrency as a reward. Central processing units handled the earliest iterations of this task, but they proved insufficient as the network grew. Graphics processing units gradually replaced them because GPUs perform the specific mathematics of hash calculation with great efficiency.

  A typical GPU mining rig incorporates several graphics cards working simultaneously, unlike a gaming PC that uses just one. Some operators ran multiple rigs at a time, multiplying their combined hashing power and energy consumption. The energy each rig consumed set the stage for some of the strongest objections to GPU mining's expansion.

• 3. The GPU Shortage

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  Between 2013 and 2017, GPU prices skyrocketed as miners purchased cards in ever-larger quantities. In June 2017, Hong Kong-based Sapphire Technology became the first company to produce GPUs designed specifically for mining. Those mining-specific cards had no display functions and could be used for nothing but calculating hashes.

  By 2021, the worldwide GPU shortage caused by mining demand had lasted for years, with production still struggling to keep pace. Supply did not fully catch up until 2023. As cryptocurrency values fell and regulations tightened, many mining firms went bankrupt. The energy demands of GPU mining operations were drawing scrutiny from regulators around the world.

• 4. Environmental and Security Costs

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  67% of the electricity powering Bitcoin mining during 2020 and 2021 came from fossil energy sources. Over those two years, Bitcoin mining produced more than 85 million tons of CO2.

  Cyber criminals also found a way to profit from the GPU boom without bearing any of its costs. By hacking into computers and running mining software in the background, attackers could harvest cryptocurrency at no personal expense. They typically limited their mining to just 25% of the target's GPU capacity, keeping the remaining 75% available to avoid detection.

  China cited both environmental and economic concerns when it officially banned all cryptocurrency mining in May 2021. Whether mining paid in any region came down heavily to the local cost of electricity.

• 5. The Profit Equation

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  Bitcoin's reward system is pre-programmed to halve every four years, or after every 210,000 blocks have been mined. At its launch, each block yielded 50 bitcoins for the successful miner. In May 2020, that figure fell to 6.25 bitcoins per block. Each successive halving compressed the return for the same computational effort, steadily squeezing margins.

  Different GPU models carried different levels of computational power, affecting how many hash attempts a miner could make per second. Newer generations offered better chips, faster clock speeds, higher hashrates, and lower power consumption. A miner running efficient hardware in a region with cheap electricity could stay profitable far longer. One running older equipment in a high-cost energy market might quickly fall into loss.

  That arithmetic changed sharply in 2022, when cryptocurrency markets turned and the value of Bitcoin fell significantly within months.

• 6. The Collapse

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  Around March 2022, Bitcoin's price dropped from roughly $46,000 to around $20,000 within a couple of months. That drop invalidated the profit projections many mining operations had depended on. In September 2022, Ethereum completed its transition from proof-of-work to a proof-of-stake algorithm, sharply reducing the computational demands of validating its transactions.

  Some miners attempted to stay in the proof-of-work space by switching to coins such as Ethereum Classic. Those alternatives proved equally unprofitable. Miners began offloading their graphics cards onto the second-hand market in large numbers, helping to stabilize GPU prices. By early January 2023, some mining companies had abandoned the search for a viable cryptocurrency and begun repurposing their systems for AI computation.