Aporte original por: micahchetrit ,
easiest way to check is set it on a table near ear height, take off the side panel and listen. It is usually not hard to tell whether the CPU or GPU is loud (rarely the PSU unless it is faulty fan or really old). both have small fans, smaller means more rpm to move the required amount of air, means louder. CPU fans/heatsinks tend to be more affordable to upgrade. If it is the CPU, a Cooler maser or zalman is usually great for the price. Let me know if it doesn't work.