I have never seen a typical load that is so close to Furmark than mining crypto currency. And people tend to do it 24/7. Heat output and temperatures are high compared to any typical gaming load. Also VRMs go easily above 100 degrees celcius which is something people often forget. Fans need to run high RPM to keep cards within acceptable operating temperatures. Indeed, temperature has pretty serious effect on failure rate of CMOS devices. Here is example with certain memory IC. Quite a big impact going from 90c to 60c, isn't it? Also integrated circuits do degrade slowly over time. Excess heat and voltage etc. only make it worse. These is ton of articles in web for those interested to read. This one for example, you could try wikipedia too: http://www.semicon.panasonic.co.jp/en/aboutus/pdf/t04007be-3.pdf PS. Every proper integrated circuit designer / electrical engineer knows this. If you are not one of them, maybe should check facts before making too much noise?