One-Sentence Definition
GPU mining is the process of mining cryptocurrency using graphics processing units (GPUs) — the powerful processors originally designed for gaming and graphics rendering that excel at the parallel computations required for certain mining algorithms.
Why It Matters for Solo Mining
GPU mining is actually perfect for solo mining certain altcoins because GPUs are way more accessible and affordable than ASICs, letting you experiment with lottery mining on coins like Ethereum Classic, Ravencoin, or Ergo. While you can’t profitably GPU mine Bitcoin anymore (ASICs dominate that), GPUs give you the flexibility to switch between different algorithms and coins based on your expected time to block. For solo miners, a decent gaming GPU might actually give you realistic chances of finding blocks on smaller networks without spending thousands on specialized hardware.
How It Works
GPUs contain thousands of small processing cores that can perform simple calculations simultaneously — unlike CPUs that have fewer, more powerful cores. Mining software divides the hashing work across all these cores, letting the GPU test millions of potential shares per second. The GPU loads the blockchain’s current state (including things like DAG size for memory-hard algorithms) into its video memory (VRAM) and continuously hashes block candidates until it finds a valid solution. You’ll need mining software compatible with your GPU brand (NVIDIA or AMD), a properly sized power supply unit (PSU), and good cooling to prevent thermal throttling. Many miners also use overclocking and undervolting techniques to optimize performance and reduce electricity costs.
Example
Imagine you have an NVIDIA RTX 3070 sitting in your gaming PC. Instead of just gaming, you could point it at a Ravencoin solo pool when you’re at school. With about 30 MH/s hashrate, you might find a solo block every few weeks or months depending on network hashrate and your luck — earning you 5,000 RVN all at once. Unlike Bitaxe or NerdMiner devices that only do Bitcoin, your GPU can switch algorithms in minutes to chase different coins.