MSI Afterburner 4.6.0 Beta 10 can undervolt gpu core to 700 mV. But I have hashrate drops when lowering voltage P104 below 850mv. Same settings 1506core/ +700mem,  850mv 40mh/s, 800mv and lower drops to 35-37mh/s. This issue happens only with gigabyte p104, msi works fine. Any ideas what happens?