Boot to Memtest86+ installed to a thumb drive, and check the RAM for stability. And w/ XMP set to Profile #1 and the System Memory Multiplier set to 18.66 at a 100 BCLK = DDR3-1866, games are still crashing? And by "crashing", are you receiving a BSOD, lockup, reboot, etc... what exactly? And if a BSOD, what's the exact error message? And which OS are you running?