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mining if you have free electric 
Free electricity doesn't mean it's profitable. You're burning up your video card/CPU at the same time. Factor in those costs.
when i was instamining alt in the past, it was basically with free electricity, because i was mining for 5 min and then repeat for another coin, and it was everything but not profitable
also if well cooled, usually custom gpu are the best, you can be assured that your gpu would last very long, and anyway gpu are not like asic, they have warranty...
This is one edge of gpu mining: the warranty of the card itself. Nowadays, altcoins mostly are GPU-dependent on their algorithms thus making GPU mining profitable (if in case these coins hit the exchanges). Also, a few cards would probably give you some profit if you mine a low-difficulty coin already out in the exchanges, it's also a plus if you got a cheap electricity.
Overclocking your GPU will void the warranty. I believe mining at 100% will as well. And sadly, nobody has lifetime warranties anymore,
.Because we live in a consumerist economy where the more you consume the better the economy is, fallacy is on.
Regardless, the maximum warranty you get is 5 years here, and that is on TV and PC. For shitty small stuff, 1 maybe 2 years.
They make shittier items for the same price (shrink-flation), to hide the inflation in the economy. So no producer will assume the risk of warranty.
Blame the money printing
XFX used to give lifetime warranties... and even better, they could be TRANSFERRED twice to new buyers (significantly increasing the resale value of their cards). Sadly, they don't do that anymore, either.
How about cryptocurrency ??
it's good?
