After I had 2 days on troubleshooting, I have the Corsair memory modules can narrow the cause. Permanent blue screens with Win 7 on a new system with MSI P67A-GD53 (B3) mainboard. These Kingston bars run smoothly and not build as high as the Corsair. To speed or behavior when overclocking I can not say much as a normal office users. Therefore, 5 points.