GTX 760 Crashing machine

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I have a problem with my computer and graphics card. The card has been very unstable recently and has been crashing whenever I run certain games, consistently with anything on the Unreal engine. Recently, the crashes have been occurring more often, sometimes when I'm just using the internet like facebook/youtube.

Specs:
GPU: GTX 760 (the suspected culprit)
GPU Driver: 359.06.
CPU: i7-4790@3.6
RAM: 8g
OS: 64bit windows 8.1
If you have any other questions on the specs, the system was a full built Asus ROG G20AJ and you can probably find everything else based on that.

This has been driving me nuts and I have tried just about everything, overclocking, underclocking, disabling the 4790's integrated card, enabling it, updating all drivers, rolling back drivers, and any combination of all of the above, but nothing seems to be working. I tried the FurMark test and it ran fine unless I clicked on anything outside of the window. Temperature wise under stress, it usually hovers around 80, but never goes any higher than 85. The crashes themselves are usually my main monitor (connected by hdmi) going a solid color (usually black) and my second monitor (connected by dvi) going black with the message "2 DVI-D: Cannot display this mode". It usually stays like this with the sound playing fine in the background as well as computer processes, or the sound catches, buzzes, and the system turns off. Either way, I have to manually restart the machine. At this point, I'm thinking the best option would be to get a new graphics card (probably a 960) to replace the one I already have, but am unsure.

On a side note, whenever the integrated GPU is turned on (intel HD 4600), the computer registers a non-existent 3rd monitor and puts an extra cursor in the top left corner of the screen that mirrors the status of whatever the actual cursor is doing.
 
Solution
I don't personally trust that kind of PSU. As you said it was a dual PSU I assume it is this one from the Asus site "180 W + 230 W Power adapter", that adds up to 410w and the recommended wattage for the 760 is 500w so that could possibly be the issue. I assume you can't fit a normal sized PSU in the case?

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The G20 comes with a dual external PSU, kinda hard to tell what kind it is as they are held in a case together with the labels in the middle. I'll edit this if I can find out. I'm not sure what is causing the issue as I have tried underclocking by 100mhz.

edit:
These are some pictures of the labels on the PSUs. I also had everything for the computer (2 monitors, speakers, 2 plugs for the 2 PSUs) routed into a single power strip if that is any help.
3bTVmZr.jpg

6FDMYMy.jpg
 
I don't personally trust that kind of PSU. As you said it was a dual PSU I assume it is this one from the Asus site "180 W + 230 W Power adapter", that adds up to 410w and the recommended wattage for the 760 is 500w so that could possibly be the issue. I assume you can't fit a normal sized PSU in the case?
 
Solution

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Yeah, that might be it. The case itself is too small for a normal psu so I will need to get something else that fits externally. I know one of those PSUs if dedicated for the graphics card so I could probably just figure out which one and upgrade it.

edit: Just used Asus GPU Tweak to drop my gpu's power usage target and it seems to be working a lot better. Prob is the power supply.
 

It may be easier in the long run to purchase a case as well as a high quality PSU, if money isn't an issue.
 

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Thanks for the help, I'm definitely going to get a better PSU for now.