HP has a solid chassis lineup for their blade servers, but if you don't purchase 100 blades all at once, you may be stuck with various Generations "G"s of their blades.
G7 - the LOM was fixed based on the base part number you started with. Then you add mezzanine cards of various models. The SD Chip to boot, is right on the side of the blade.
G8 - So, now you can CHOOSe the LOM module you want and swap it out if you want. You can add mezzanine cards, but WOW, the G7s don't fit in the G8s. A big disappointment to me when I had 8 extra 10GbE FlexFabric adapters from the G7s at 3K each and couldn't put them in the new G8s.