.Multicast MAC addresses are the MAC addresses start with 0100:5e . MAC address has 48 bits and consist of vendor code and host code. But for one MAC address, only the last 23 bits of that MAC address is used to provide multicast MAC address. The first 25 is fixed .
Do you have adequate cooling around your VRM's? Your CPU can be a bit demanding with power consumption, and can cause some strange issues, especially on an older board.
Lastly, update all your system drivers if possible to see if that resolves the conflict... Looks like there might be an...