I would actually be quite interested in seeing some numbers to back that up, but I'm not sure if there have been studies on the damage of mining yet.
In some ways, letting a GPU run at a constant load (and thus constant temperature) is less damaging than a typical gaming workload I imagine, where the temperature fluctuates often. In other ways it probably isn't (e.g. atoms of the chip 'migrating' over time with the constant electron flow, though I have no idea how much of an issue that is with modern chips).
In some ways, letting a GPU run at a constant load (and thus constant temperature) is less damaging than a typical gaming workload I imagine, where the temperature fluctuates often. In other ways it probably isn't (e.g. atoms of the chip 'migrating' over time with the constant electron flow, though I have no idea how much of an issue that is with modern chips).