First of all the new New M3 Cisco UCS C-Series Rack-Mount Servers are Kick-Ass machines.
But why use a C-Series at all when full height Blades are a lot easier to setup and don’t require extra FEX’s?
1) To use an expansion card it has an extra slot. Will not find that on the blades, unless it is for a second Palo card on a full height.
2) Local storage is needed on the blade past what 2 drives (standard) can do. Also many (most I hope) UCS Blades are boot from SAN. Even though adding a second drive or expanding a drive is easy, it can be pricey on some SAN setups. Like if the Boot SAN device is SSD.
But this does bring up an interesting idea. Might a vendor make UCS 5108 chassis compatible expansion card to use as second card on a full height blade?