O yes!
Recent southbridges (or IOH or ICH or however they call it) don't have PciE 3.0 though Intel's doc is misleading on the 5 series, where the Cpu has it for graphics card interface. Yet PciE 3.0 would be necessary for any serious extension, like Sata/6000 or Usb3.0 or 10Gb/s network.
Nor do they have Sata/6000. Alas, chips added on the mobo are limited by the PciE 2.0.
They also lack Usb 3.0, and added chips are bad for that same reason.
This is all very disappointing, and I will certainly not replace my P45+E8600 by anything until chipsets have improved. It would be about time.