All are valid but there's no water leakage anywhere and the psu is 1000watts platinum and my wall meter shows 330w max draw!!
My last change was the graphics card. I've noticed the pc gets very hot when it does that but all monitoring programs i have like hwmonitor shows all temps ok, more than ok actually.
I think that possible reasons are:
1. The temps sensors have malfunction.
2. Something gets hot on the motherboard
Next thing i'll do is to put one fan near the intake of the graphics card, because i still have the original gpu fan for cooling the vrm section as well the watercooler, and see what happens. Maybe thats where the problem is.
With the amount of cooling that graphics card has I doubt that it is overheating, the VRAM doesn't even need a fan for cooling at all on most GPU's, mine doesn't! But are you sure that your water cooler is making good contact with the die and there is some thermal compound applied (thin layer)?
If you really think it's overheating in some way but the major components are cool enough then perhaps it is, as already mentioned, the PSU. It seems a likely reason for the sudden black-outs tbh. If you've got another PSU to try for a while then perhaps I'd give that a go.
Also, if you think something is overheating on the Motherboard then check the chipset heatsink is clipped/screwed in properly. If you're not already, use HWiNFO to monitor Motherboard temperature.
