BTW, here are a few things you can do to reduce mobo power consumption.
1.If Intel cpu, then you should be able to undervolt the cpu.  My Has(h)well cpus are happy with 75-100mV undervolt of both core,  cache and graphics sub-unit.  You can dl the Intel XTU for this.
2.Install only one stick of RAM.  Any dual RAM module setup will likely double the RAM power consmp.
3.Disable serial and parallel port in BIOS.
4.Disable any mobo RGB
5.Avoid HDD, use SSD or USB