benjiven

@rcmaehl covered it. There's your answer. As for troubleshooting, have you tried re-formatting your drive and reinstalling windows fresh to see if the input lag still persists? Are you using a wired mouse and keyboard?

Too much voltage/amperage. Your PSU will prevent this from happening since EVGA lists
OVP (Over Voltage Protection) UVP (Under Voltage Protection) OPP (Over Power Protection) SCP (Short Circuit Protection) OCP (Over Current Protection) Adding a surge protector will help minimize this and a UPS will help provide constant clean power, but is overkill.

Definitely overkill, especially for lower-end budget computer systems. But when someone spends 2-3k on a computer, an extra 100-200 to ensure you have enough time to properly shut down the computer in the event of losing power is pretty reasonable.

A good PSU will filter out any dirty power going into your PC.
None of your components will get damaged from brownouts.
 
 
 
A surge protector does literally nothing except act as a breaker when there is a power spike.
It would not change anything here.
It does not interfere with the power delivery.

Most of the problem I can see with brownouts is undervoltage on the input side of the PSU, which for a constant power load means more current is required. That is, power is voltage multiplied by current. If power is constant and the voltage drops, then the current has to go up. If the AC side of the PSU receives more current than it was designed to handle, plus some change, for extended periods of time, this will cause overheating which does lead to component damage if not catastrophic failure. A good quality power supply will do its darnedest to make sure the output side is clean, so I don't see how brownouts would affect the output side.
 
The only way I can think that would cause stuttering is the power supply the increased current causing enough problems on the input side that the PSU's power output is lowered, so it can't handle spikes of power as well as it could've. However, you pretty much have to be driving the power supply hard to begin with outside of a brownout condition.

It would most likely be on the PSU side.
 
As for damage, it depends on what was damaged. But for a rule of thumb, it will just not work or you won't be able to apply any decent load on the PSU.

Thanks a lot!

I have stuttering in all games and I frankly just want to get rid of the rest of my components. I can sell them and upgrade, but obviously it's rather expensive having to do a full update of RAM and Mobo.
 
What would be a worthwhile upgrade fro my 4790. I am thinking an 8700k would suffice for my 1070?