Gday fellas

Was adding two 1x extenders to my rig today, turned it on and *snap crackle pop* *burning etc*

Fried this part on the mobo (see photo), can anyone identify what it does?



Mobo still works, only get onboard graphics output though, no love from the PCI slots.

FYI I have 7 cards on this rig, 4 of which are powered. I was adding 1x 1x risers (unpowered) to two of the 1x 16x powered risers.

I have done this on another rig with no issues.