I've been like three times now that my rig will reboot itself after four hours of mining, I've checked the temp and it never exceed 56°C and also I've changed my ram stick too, what other thing to look out for?
Basically zero info so all answers to. you are merely a guess.
A) what is your psu
B) how many what do you pull at the wall? you need a k-watt meter.
If you mine and don't have a kwatt meter you are mining blindfolded.
So if you have a 1000 watt ATX psu and you pull 950 watts at the wall you are overtaxing the psu
but if you have a 1000 watt server psu and you pull 950 watts at the wall you are okay.
Next set of guesses.
56°C I guess that is the highest temp of any one gpu. It is likely to be good.
speaking of your gpu's do you have 1 or 2 or 3 or 4 or 5 or 6 don't know
also maybe you are mining with your cpu xmr-monero and the temp is that of your cpu.
So
how about
how many gpus ?
the psu make and model ?
what coin you are mining ?
the motherboard ?
watts at the wall using a kwatt meter ?
What software do you use?
what are the clocks you use?