Don't listen to this. It won't die fast if you do it properly. Eth mining is memory intensive, not GPU intensive. I used to run my cards with memory overclocked by a few hundred MHz, core downclocked by 400 MHz, power limit at ~75% and with fans on ~50%. GPU temperature was always below 60C and memory temperature was always pretty low as well.
You will end up paying more in electricity bills than you will earn in this scam with that setup. And when CPU/GPU/FAN dies because of 24/7 heat there goes profit dreams for the next 10 years when you have to purchase a new part.
might as well just steal money form your nighbours, like that guy said,0.2 eur per 24H, if you really wanna fucking fry your graphics card (you are asking for it) for 4 euros a month sure, go for it retard
get nicehashminer and you can see in benchmark. it's for bitcoin mining, but you can convert it in your head...
with amd r9 390x
and ok processor i could make about 0.25€/24 hours.. not worth it