ASUS GTX 750 TI OC causing reboots

[Doodleschmit]

so, to start off, first time post, so I apologize for any weird formatting, or bad descriptions.

So, for formatting's sake: here is a Table of Contents:

I The Story
II The Problem
III The Attempted Solutions
IV My PC Specs

I'm sure most solutions could be found from Chapter 2 on, but in case you are looking for more details, the full story will be here.



Chapter I
The Story

Around Christmas I got the above described Graphics card (ASUS GTX750 Ti OC) to add to my tower. The moment I installed the new card, my problems started. The first thing to note, my old card (Sparkle GTX 560) that was in the tower accepted two of the PCI-E power cables. My new card only wanted one. The ones that are in my tower are linked together, coming from the same cable together. so, I unplugged my old card, and replaced it with the new one. I used only one of the connectors (obviously) and when I attempted to turn on the computer, it would go to POST, show the Windows 8 logo and spinnies, then promptly reboot itself. rinse, repeat until I would manually force the tower to shut off. I found a couple of newer versions of my BIOS for my Mobo, so went inside and updated the BIOS. still didn't seem to function properly. So, I tried to switch which one of my two cables I was using. Computer finally booted properly. That ends the original problem I had.

But now I have a new one.



Chapter II
The Problem

Essentially, whenever I play graphics heavy games, (World of Warcraft, Battlefield 4, Dying Light) My entire tower will just instantly reboot. This seems to happen inconsistently. Sometimes, it'll happen within minutes of starting the game, or a couple of hours. If it happens once, then it will more than likely happen faster every time I start the game again.

For the time being, I swapped to my old GPU. computer functions without problem. So, there has to be something incompatible with the card



Chapter III
The Attempted Solutions

• 
  First thought it was my HDD, because it was having massive latency times, swapped to SSD, and bought a new HDD.
  
  Attempted BIOS updates to my Mobo
  
  Completely formatted and reinstalled Windows 8 (after the SSD and HDD switching ,mentioned in the first part of this list)
  
  Completely uninstalled and reinstalled Nvidia Drivers
  
  Monitored CPU and GPU temps, everything stayed below 70C
  
  Attempted to use a Windows RAM checker to see if memory was the problem, nothing reported
  
  RMA'd the card to ASUS for repairs. returned about a week ago. problem persists.
  

Chapter IV
My PC Specs

• 
  Motherboard - Gigabyte GA-B75M-D3H
  GPU - ASUS GTX 750 TI (previously Sparkle GTX 560)
  CPU - Intel i7 3770k @ 3.5GHz
  PSU - SolyTech Sl-8750EPS, 750W PSU (couldn't find a pcpartpicker location for this)
  RAM - 4x4GB ADATA DDR3 (also no pcpartpicker location for this, either)
  Storage - SSD - Crucial M500 (240GB)
  Storage - HDD - WD Caviar Blue 1 TB
  

So, I'm hoping this is some easy silly solution that I just never considered. while I have plenty of general knowledge about PC building, there is a LOT I don't know. So, go easy.

 

[ZeusGamer]

When you uninstalled your Nvidia drivers, did you happen to use Display Driver Uninstaller? If not, then you probably would want to try this one out first. Make sure that when it prompts you to do this on Safe Mode, that you do so. Otherwise, it's gonna cause problems with your system. Although I don't think that it has something to do with your Nvidia drivers, this is a very safe thing to do. Then just reinstall new drivers. If the problem still persists, then I believe the culprit could be your PSU. Not all PSU's are compatible with the Haswell C states. So, just make sure that your PSU is compatible with Haswell processors.

UPDATE:
I know that you might be thinking that you shouldn't have to uninstall drivers and reinstall them again because they're gonna be using the same drivers anyway, but trust me. You'll get better results reinstalling them EVERY TIME you install a new GPU. But like I said, if the problem still persists, then I'm really going to blame your PSU.

 

[Doodleschmit]

When you uninstalled your Nvidia drivers, did you happen to use Display Driver Uninstaller? If not, then you probably would want to try this one out first. Make sure that when it prompts you to do this on Safe Mode, that you do so. Otherwise, it's gonna cause problems with your system. Although I don't think that it has something to do with your Nvidia drivers, this is a very safe thing to do. Then just reinstall new drivers. If the problem still persists, then I believe the culprit could be your PSU. Not all PSU's are compatible with the Haswell C states. So, just make sure that your PSU is compatible with Haswell processors.

UPDATE:
I know that you might be thinking that you shouldn't have to uninstall drivers and reinstall them again because they're gonna be using the same drivers anyway, but trust me. You'll get better results reinstalling them EVERY TIME you install a new GPU. But like I said, if the problem still persists, then I'm really going to blame your PSU.

Okay, actually, I think I may be coming closer to a solution. Windows Event Viewer finally showed me something. It shows the restart as kernal power issue. I think it might have something to do with the previous setup of my tower. It came as a prebuild. And the PSU PCI-E power cable has the two-way split connector for the old card. My new card only has one spot to accept power. Could it have something to do with that? Is there a way to make that power connector a single only?

Picture for reference:
http://imgur.com/hrp89N7

And yeah, I have done full re installs, just not exactly through that system. But since I have done complete wipes of all my old partitions and completely reinstalled Windows 8 shouldn't that have almost the same effect?