s0mersbybg_

Don't go overboard with top exhaust fans. I learned the hard way that it chokes the CPU cooler to death. I have x2 120mm top exhaust and x1 120mm rear exhaust. Had to put top exhausts to minimum RPM in order to balance out the pressure and air movement throughout the case which is Meshify C

I assume you're talking about your tower CPU cooler? The way its installed in the picture is ideal. It gets fresh air from the intakes rather than a lovely toasty breeze from the GPU

My EVGA 2080 ti XC uses a 850 Watt PSU with a i7 8086k overclocked to 5.1ghz.
When one of my EVGA FTW3 Ultra 2080 ti was on that system sometimes it would not display and I had to switch off the PSU using its power switch and switch it on again to get it to work. Now it is on a 1000 watt PSU and it works perfectly.
 
I have 2 FTW3 Ultras and both had the same issue. I also have a 860 Corsair Platinum and a EVGA 850 gold and both had the same issue with the FTW3 Ultras.
The EVGA XC uses about 30 watts less than the FTW3 Ultras but that is the only obvious difference. 
 
So my advice is get a 1000 watt PSU. When the time come to upgrade to a 30 series or 40 series you will probably need it anyway.
 
Here is the power range of my cards according to GPUZ. The XC uses 30 watts more and the FTW3 Ultra uses 15 watts more.

gpu: 250, cpu:150, rest of system: 100. yes it's fine

I wouldn't run the 550.

According to the link shared, its a 2019 offline ransomware encryption that hasn't been cracked yet or at least publicly. Your best bet would be to wait or just forget the files.

Have you tried running anti malware like malwarebytes or similar in safe mode without networking? 

Yup, if you are ok with used, look at used GTX 1080.