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Historical Feasibility: Mac Mining Before The Merge
Prior to The Merge, it became technically viable to mine Ethereum using specific Mac models. Notably, software engineer Yifan Gu demonstrated how to leverage the integrated GPU in Apple’s M1 chip for Ethereum mining. This breakthrough confirmed Apple Silicon’s computational capacity for hashing.
- Apple M1 Performance: An M1 MacBook Air typically achieved around 2 MH/s (megahashes per second). This was a modest rate compared to dedicated GPUs.
- M1 Pro Potential: While theoretically capable of higher rates (up to 24 MH/s due to memory bandwidth), practical M1 Pro performance often fell short of this peak.
- Older Macs: Older Mac models with NVIDIA GPUs, like those based on Maxwell architecture, found Ethereum mining extremely limited, often described as “barely mineable” due to Ethash algorithm demands.
- eGPUs: Using external GPUs with a MacBook Pro was technically possible but generally deemed impractical due to setup complexity and low returns.
Historical Practicality and Profitability
Even when Ethereum mining was possible, using a Mac was largely impractical and unprofitable for serious miners. The low hash rates from Mac hardware struggled to compete with purpose-built mining rigs.
- Minimal Returns: An M1’s 2 MH/s typically yielded very low daily profits, estimated around $0.14. These meager returns made it hard to justify the effort, electricity, or hardware wear.
- Niche Use Case: Some users, already running Macs for other crypto tasks (e.g., Monero CPU mining), viewed the M1’s small Ethereum mining contribution as a minor bonus (“why not?”), not a primary objective.
- Overall Advice: The community consensus was clear: for serious cryptocurrency mining, Macs were not the optimal tool, with dedicated hardware offering superior efficiency and ROI.
Why Macs Are Not Ideal for PoW Mining (Then and Now)
Regardless of Ethereum’s transition, Macs are generally unsuitable for sustained, profitable Proof-of-Work (PoW) mining for several key reasons:
- Inefficiency: Apple hardware, designed for general computing and creative tasks, isn’t optimized for the continuous, repetitive computations of PoW mining. Dedicated GPUs from NVIDIA and AMD are engineered for this efficiency.
- Hardware Longevity: Running a Mac’s GPU at peak capacity constantly can strain components, potentially shortening its lifespan. Macs are premium devices not built for such rigorous, non-stop workloads, and their thermal systems may struggle.
- Poor Power-to-Hash Ratio: Even if a Mac achieved a decent hash rate, its power consumption relative to that output is often inefficient, eroding potential profits compared to specialized mining hardware.
Mining Other Cryptocurrencies Today
While Ethereum mining is history, various other Proof-of-Work cryptocurrencies remain mineable. However, the same efficiency and profitability limitations observed with Ethereum on a Mac apply. Mac hardware is generally uncompetitive against specialized mining equipment, making substantial profits unlikely for most.
