Yea, those events are created every time Windows is instantly shutdown as in a loss of power. When my PSU first started going out, it seemed random and then eventually got to the point where I could recreate the incident easily. But mine only happened when my GPU would was under heavy load like gaming or benchmarking. It never got to the point though of shutting down just doing desktop sh*t. Also, my system never restarted. It would reset but remain powered on. I had to hit the reset button or hold the power button to power the system down and turn it back on to get back to Windows.
Ok, there's 2 things I think of right now to check.
1. This will be the easiest to check and probably the least likely to be the problem. Your APC BR1300G UPS and your Corsair GS800 PSU with active PFC. I've been doing some research lately because I've been looking into a new UPS and I've come across statements from UPS manufacturers and the general public alike that some UPS's that don't produce a pure-sinewave waveform can cause issues with some active pfc power supplies. I can't get the manual for your UPS from APC's website because it's not functioning correctly at the moment when I try to search products but newegg's listing for your UPS doesn't dictate that it's a pure-sinewave UPS. But from what I read it's only a problem when the UPS switches to battery. Easy to test as all you need to do is unplug your UPS from the wall while your system is running and see if your system stays running properly when the UPS switches to battery. Or if your UPS has some sort of test button/function to switch to battery without unplugging it from the wall. If your system stays running correctly when the switch to battery happens then this is not the problem.
2. This one is much more probable I think. It's your overclock. Your system may be overheating or your overclock isn't stable for some reason even though you are water-cooled. Which would mean there's an issue with your loop. I would think Asus has a utility that can monitor CPU/system temps and I know AMD's catalyst control center can monitor temps of your GPU. Considering your system last restarted while copying a file from a .rar, I would lean more toward your CPU than GPU. Run prime95, or another CPU benchmarking tool if you know one, and monitor your temps and see if they elevate too high. Or if your CPU benchmarking tool reports any errors. If they do elevate too high or report errors with your overclock, go back to default settings and see what happens.
If temps are fine, we'll think of some more sh*t to troubleshoot. And the only way to test if it's your PSU at this point is if you have another PSU to test in your system. A PSU tester won't detect anything at this point.
Do be prepared to do a lot of testing unless you're lucky and we find the problem early. I tested my bastard of a computer for like 2 weeks, including a reinstall of Windows, every ****** video driver available for my Sapphire 6970, lengthy RAM tests and testing all of my components in other known working systems, before I was finally able to test another PSU and everything worked fine. It was frustrating and I felt like kicking a puppy and punching a baby in the face by the time I was done.
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