Re: I have an AsRock Z68 Extreme3 Gen3 Mobo and running into crashing/other problems
Sounds like you video card is overheating.
Download MSI Afterburner and install it and Kromptor that also comes with.
Use afterburner to monitor it and Kromptor will stress the video card only.
If that passes and temps are fine, then try Linx to stess the CPU and use realtemp to monitor temps.
LinX - A simple Linpack interface
Real Temp - CPU temperature monitoring
ASRock Z68 Extreme3 Gen3 i7 2600K 8GB (2 x 4GB) G.Skill 1333 CL9 MSI HD 7750 Corsair TX850 80Plus
GigaByte A75-UD4H AMD A*-3870K 8GB (2X4GB) G.Skill 1866 CL8 On-Chip 6550D Antec EA-450 80Plus Platinum