Problem description:

About once, maybe twice a day when using my computer it will suddenly reset. No warning, no bluescreen nothing. It doesn't seem to happen while browsing (or at least, not yet) but it has happened both when streaming video and playing games. Sometimes I can play for hours, a couple times its happened within 15 minutes of each other.  To be clear, there is no error message at all (and I have tried turning off the automatic restart function to get one, still nothing)

Attempted fixes:

I've tried updating all my drivers, I've flashed/updated my Bios to its latest version, I've purchased a brand new battery backup surge protector. I ran Whocrashed, and there doesn't seem to be any crash reports filed. A full AVG scan found nothing as well. I've ran several heat monitor apps, and even under a heavy load my highest cpu tempt is 59c and my high gpu temp is 67.  Memtest86 found no errors.

Recent changes:

My entire Rig is brand new except for one slightly older SSD. The only recent change was paying a store to install a water cooler and clean up the wiring.

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Operating system:

Windows 7 Home Premium 64bit

System specs:

Power Supply = EVGA 110-B1-0750-VR 80 PLUS Bronze 750 W 5 yr Warranty Semi-Modular NVIDIA SLI Ready and Crossfire Support

Graphics Card = EVGA GeForce GTX 970 04G-P4-2974-KR 4GB 256-Bit GDDR5 PCI Express 3.0 x16 SLI Support Superclocked ACX 2.0 Video ...

CPU = Intel Core i7-4790K Devil’s Canyon Quad-Core 4.0GHz LGA 1150 BX80646I74790K Desktop Processor Intel HD Graphics ...

Motherboard = ASUS ROG MAXIMUS VII GENE LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard

Ram = G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2400 (PC3 19200) Desktop Memory Model

hard Drives = SAMSUNG 850 EVO MZ-75E250B/AM 2.5" 250GB SATA III 3-D Vertical Internal Solid State Drive (SSD)

I also have a 500g SSD which make and model escapes me, but I believe that it is a samsung as well.
 
I run two monitors as well
 
 
Some googling around has shown me that others have had the exact same issue with my card, is my only option an RMA?

You can try BlueScreenView and in Advanced Settings redirect it to LiveKernelReports in the Windows Folder: http://www.nirsoft.net/utils/blue_screen_view.html
 

I had the exact same power supply and had the same problem with my 980 TI. It would instantly reset at 95%+ GPU load. I plugged in a modular GPU 2x8-pin connector to a different port on the PSU and my problem was solved.
 
I did end up replacing the PSU for a 850W G2 because I was getting awful coil whine, however.

If it happened after the restart then it probably doesn't really matter.  Its probably an error that happened when Windows was loading, which doesnt have anything to do with the issue.
 
But if it happened before then it may of caused the issue, or maybe it was coincidence. I would try to get the crash to occur again and see if you get the same results before reinstalling everything.

Sounds like a psu issue.

I hope this isn't a thread necro.
 
Anyways, I went out and bought a brand new PSU.  Slotted it in, everything seems to be working okay and then it happened again.
 
The only thing I can think of it being at his point is my GPU, right?
 
I don't think its a wiring thing (house wise) as I'm currently plugged into a battery backup surge protector but anything is possible I suppose

Do you still have errors in event viewer leading up to the crash?

As far as errors prior to the event, nothing exists prior to the reboot.  All I see are events that occur after a reboot.

korva
As far as errors prior to the event, nothing exists prior to the reboot.  All I see are events that occur after a reboot.

The errors that happen after don't matter really. It's semi normal to see errors during a boot (windows loads and all). But if there's nothing in the seconds prior to the shutdown then it's likely a hardware related issue.

If you think it could be ram, do 2 runs of memtest86.

my money is on power supply same thing just happened to me it started off slow rarely doing it then got worse until it would do it as soon as windows loaded replaced the power supply everything is all good now.

Currently encountering the same issues when playing games like Metal Gear Solid Ground Zeroes and Mad Max.
 
Other games like Farcry 3, Hearthstone, and Fallout 3 seem to be having no issues with hours of play. New PSU arrives this afternoon, hopefully this addresses the issue. CPU stress tests are fine, GPU stress tests are crashing my box. So it's either a voltage issue or a GPU issue. I'm hoping the new PSU fixes the problem. Fingers crossed, will update after the part gets replaced. (sometime this weekend)