OCZ EVP (Extended Voltage Protection) is a feature that allows performance enthusiasts to use a VDIMM of 1.85V without invalidating their OCZ Lifetime Warranty.

however i don't know why your motherboard overvolt your ram , other user haver -0.04v vdroop :| ... i don't know i don't have your motherboard sorry ... but i think it's safe run your ram at 1.856v...