I was going through the VPc documentation and stumbled upon this
Single Homed Fabric Extender vPC Topology
The Cisco Nexus 5000 Series switch can support up to 12 configured single homed Fabric Extenders (576 ports) with this topology however only 480 dual homed host servers can be configured in a vPCs with this configuration.
Is there a specific reason for supporting just 12 single homed FEX
How does the calculation of 480 dual homed servers is arrived
The chances of a correct response will be higher if you could post Nexus 5000 related questions to that forum.
UCS FI's are not vPC peers.
I will take a stab at it ..but please do confirm with a detailed answer on the Nexus 5000 forum ..
The limitation of the number of FEX to a Nexus 5000 comes from various sides like number of fabric links, static vs port channeling, QA resources to qualify it etc. The Nexus 5000 supported upto 12 port channels with a max limit of 16. That is where I believe the number 12 comes from -
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