Glossary › PC Repair › Ex-Mining GPU
What is an Ex-Mining GPU?
An ex-mining GPU is a graphics card that was run around the clock to mine cryptocurrency. Huge numbers of RTX 30-series cards were used this way, then flooded the second-hand market after Ethereum stopped GPU mining in 2022.
Are they bad?
Not automatically. Many miners ran cards undervolted at steady temperatures, which is gentler on the chip than some gaming. What wears out are the fans, the thermal pads on the memory, and the thermal paste. Cards with hot GDDR6X memory, such as the RTX 3070 Ti and 3080, are the ones to check most carefully. In Singapore’s humidity, look for corrosion on connectors and screws too.
Warning signs
Flickering, coloured dots or lines on screen (artifacts), crashes under load, grinding or rattling fans, very high memory or hotspot temperatures, missing or tampered warranty stickers, and a seller who won’t show it running.
How to test before you pay
Run a 20–30 minute stress test or a demanding game. Watch the GPU hotspot and memory temperatures, check for artifacts, and confirm the VRAM amount and model in GPU-Z. Then compare the card’s score against our RTX GPU comparison — a card far below its expected performance is a red flag.
The safer alternative
If you’d rather skip the gamble, every graphics card in our stress-tested gaming PCs has already been through these checks, repasted where needed, and comes with a warranty — and you can test the exact build in-store before paying.