I have your older Sister chip the i5-3570k ^.^
Sooo… If you are willing, I will go through a full system reset and we can put this together one piece at a time… remember, if in doubt rip it out.
Step one, remove everything from system, make it a barebones system that can boot… no optical drives, no extra drivers… Just memory, processor, and default video…
(oh before we go further, you disabled the onboard intel video?)
Then, your first step is to load up the system for the first time, while it loads windows make sure you TURN OFF UPDATES and DO NOT REGISTER WINDOWS yet.
After it seems stable, shut it down and just install the graphics card… Start your system and let windows install a base driver… (it might have a good enough driver)
If the system recognizes your card and loads a default for it you should be ok for now, otherwise, go grab your drivers from its manf and install those.
(you will be doing this adding the vendor drivers, but the idea for now is to keep all foreign software on the system.)
Load the game on the minimal setup… play and see if your experience rises.
IF IT DOES HAPPEN… you most likely have a hardware issue. Common suspects at this point are the memory sticks and then the power supply… thats about it.
(see thats why you start your computer builds NAKED ^.^)
if your system does not display the issues from before, then there is a software problem from this point out… now its time for selective installs
(remember, windows is not updated yet)
Anyways, at this point you install ONLY what you use on the system… METHODICALLY… see below.
(EACH TIME YOU ARE ABOUT TO INSTALL SOFTWARE, CREATE A RESTORE POINT WITH WINDOWS)
Now, install your software piece by piece and creating restore points to jump backwards. As you go through this you will also be testing your system after EACH PIECE OF SOFTWARE is installed)
Continue to do this till you find the offending software.
(Now… video drivers from vendor)
These have caused issues in the past because they come with bloatware and that is why we never load their software in full… So if you can… just grab the drivers)
Now 2 days later… Let me know where you stand.
Welcome to tech install 101
edit::ps I havent found mine yet, but there is a software you could get, it runs whats called burn in test. it will run all the cycles on your machine searching for memory leaks and hardware faults.