I'm at a loose I built a gigabyte 1156 i7 870 If I enable the c3/c6/c7 in the turbo boost bio's I get blue screens doing a chkdsk and installing windows when it gose to the reboot at 30% loaded. I have a second motherboard from gig to test with and I get the same results. Enable the c3/c6/c7 and I get blue screens disable it and the box is stable.
MB GIGABYTE GA-P55A-UD3 P55 R
VGA EVGA| 768-P3-1360-TR GTX460 R
PSU CORSAIR|CMPSU-750TX 750W RT
CPU i7 870
MEM 2Gx2|GSKILL F3-12800CL9D-4GBRL
If your memory isn't set up right, it can cause stability issues. I would set the timing to the advertised specs. Most all memory defaults to a lower or lesser speed and etc and has to be set up correctly.