Hi Sushant
This has been discussed before
https://supportforums.cisco.com/discussion/12130401/vnic-bandwidth-question
https://supportforums.cisco.com/discussion/12207581/m81kr-vic-1240-and-vic-1280
https://supportforums.cisco.com/discussion/11897266/vic1240-and-2208xp
https://supportforums.cisco.com/discussion/11500981/vic-1280-vs-vic-1240-port-expander
https://supportforums.cisco.com/discussion/11900386/10g-between-adpater-and-blades-vic12401280
https://supportforums.cisco.com/discussion/12321671/ucs-enabledisable-dce
Cheers
Walter.