mezzanine card speed

Hi @twadeus,

From Dell Blades doc at http://support.dell.com/support/edocs/systems/pem/en/hom/html/blades.htm#wp1453839

Full Height Blades:

* The M610x supports two small-form factor (SFF) mezzanine cards. x8 PCIe Gen 1 and x8 PCIe Gen 2 cards are supported.

* M910 supports SFF mezzanine cards in all four slots. x8 PCIe Gen 1 and x8 PCIe Gen 2 cards are supported.

* The M710 supports SFF and LFF mezzanine cards in all four slots. x8 PCIe Gen 1 and x4 PCIe Gen 2 cards are supported.

* The M905 and M805 blades support LFF x8 PCIe Gen 1 mezzanine cards in all four slots.

Half-Height blades:

# The M710HD supports SFF and LFF mezzanine cards. x8 PCIe Gen 1 and x4 PCIe Gen 2 cards are supported.

# The M610 supports two SFF or one SFF card and one LFF mezzanine card. x8 PCIe Gen 1 and x4 PCIe Gen 2 cards are supported.

# The M605 and M600 blades support two LFF x8 PCIe Gen 1 mezzanine cards.