hmm...
Do you know exactly how long ago the issue first started happening? From here there's just a few more things I can think of:
1. Let the pc run that suposition benchmark looping overnight (at least 6 hours) and see how it handles running it for a prolonged period of time.
2. If that doesn't crash then downgrade to the 2nd newest videocard driver to see if the issue still happens with mass effect and other games. If it does still happen then you can rule that out and switch back to the newest driver.
3. Also, don't forget to check the s.m.a.r.t. values for your ssd to make sure it's healthy. You can go to the device manager, click on "disk drives", and that should tell you what kind of ssd you have. Usually the manufacturer will provide a utility that makes it easy to see the s.m.a.r.t. values and drive health, for example, Samsung has the Samsung Magician utility and Intel has ssd Toolbox. Actually, I think Intel toolbox will even give the s.m.a.r.t. values for any kind of ssd or hdd:
https://downloadcenter.intel.com/download/26776/Intel-Solid-State-Drive-Toolbox
4. Download OCCT:
http://www.ocbase.com/index.php/download and then when you start it you should see what it's reporting for your power supply's 12v, 5v, and 3.3v rails like this:
I'd just want to know what numbers it reports to make sure the psu is running within spec. One thing you could also do is run the suposition benchmark in windowed mode and then leave this running too so that you can see what the power supply is doing under load in real time.
5. As a last-ditch effort, perhaps reinstalling windows and seeing if the issue still persists.