My rules for this.
when it got burnt.. replace it.
So tell me do i need to replace this part or i can use the motherboard without it and using the vga slots on graphic cards instead of the motherboard? If i need to replace it do you know how much it cost?
you can actually use those GPU cards instead of onboard VGA's, just don't use them for any activities other than mining.
motherboard price? see newegg.com