1-UCS C-series support VM-Fex.
2-The 5k series don't support F1 card. F1, M1, M2, etc.. are supported on the 7ks.
UCS manager runs on the 6100 and 6200 series fabric interconnect devices.
here is more info:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/layer2/513_n1_1/b_Cisco_n5k_layer2_config_gd_rel_513_N1_1/b_Cisco_n5k_layer2_config_gd_rel_513_N1_1_chapter_010101.html#concept_6A0DA0AE4323414E8FE667CAB20C1234
UCS manager:
http://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/ucs-b-series-blade-servers/data_sheet_c78-520522.html
HTH