Just took a closer look and the label on the MB does show the second slot as X4, interesting! Does the manual say it is only x4. Perhaps a newer revision allows the second slot to be x16 and the MB labeling was not changed!?
Just clicked on the Rev3.0 and it too says 2 PCIs X16, but the MB label is still 4X!!
Sorry...Specs do say second X16 slot running at X4...?
Is there anyway I can check on my computer using a program?