i guess i will have to run some memtest. stock xmp is 1.65v 1600 9 9 9 28 1t but i have mine at 1.65v 1866 9 10 9 28 1t.
It sounds like you've likely found the cause of your BSOD. You should be running the RAM at the recommended settings. Even then you're pushing the RAM controller pretty hard. The Intel RAM controller official voltage is 1.5v. There is some debate on if 1.65v RAM is safe for everyday use.
You could also be running into an unstable overclock. 4.8GHz is pretty high for an i5-2500K. What CPU voltage are you running? What software have you used to test for system stability?