Fried my Mobo - Z77A-GD65 - Can anyone identify what i've cooked?

[SeaEagle]

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?

http://s17.postimg.org/8zl6c8han/Burnt.jpg

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.

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[vm1990]

its something to do with the PCIe controller, if you look there are always the smae number of chips as there are PCI-e slots (not including PCI slots)

id assume the first one controls the top slot

http://archive.benchmarkreviews.com/index.php?option=com_content&task=view&id=817&Itemid=69&limit=1&limitstart=1

scroll down to the image of the chips and yours is there it should say p13pcie
which is
"a P13PCIE multiplexer/switch chip to reallocate PCI-E lanes"

[xray]

have a look where the 24pin power goes to the mobo , and see if 1 or 2 of the pins have burnt away