The graphics processing unit in a computer handles tasks related to displaying visuals and can be part of a dedicated card or integrated with the motherboard. Like any other computer component, the GPU is subjected to strain when under heavy loads or overclocked. Indications that a GPU is reaching the end of its lifespan usually include visual anomalies, instability and poor performance along with increased fan noise.
Common Indicators of a GPU problem:
Increased Fan Noise
Crashes and Lockups
Reduced Performance and Instability