A couple of minutes while gaming my computer screen freezes and cuts to a blue or red screen. I have tested to make sure that I am not overheating, which I never get above 60 degrees. I do not think that it is my power supply as I should have enough power with 750w. Any advise would be greatly appreciated. 
Here is my specs:
AMD FX-6300 3.5GHz 6-Core Processor with hyper 212 Evo
Gigabyte 970A-UD3P
A-Data XPG V2 1866 2x4GB
Samsung 840 EVO 250GB
Seagate Barracuda 1 TB HDD
Gigabyte Radeon R9 270X 2GB WINDFORCE (2-Way CrossFire)
Corsair 300R ATX Mid Tower Case with NZXT 140mm Performance Case Fan x5
Rosewill Capstone 750W 80+ Gold Certified ATX Power Supply

Here is my specs:
AMD FX-6300 3.5GHz 6-Core Processor with hyper 212 Evo
Gigabyte 970A-UD3P
A-Data XPG V2 1866 2x4GB
Samsung 840 EVO 250GB
Seagate Barracuda 1 TB HDD
Gigabyte Radeon R9 270X 2GB WINDFORCE (2-Way CrossFire)
Corsair 300R ATX Mid Tower Case with NZXT 140mm Performance Case Fan x5
Rosewill Capstone 750W 80+ Gold Certified ATX Power Supply