Does your Server have 3.5"/LFF drives (4 total), or 2.5"/SFF (8 total)?
There are only a couple of models for the C220-M3:
UCSC-C220-M3L for large form factor and UCSC-C220-M3S for small form factor.
What are you trying to ascertain from the model #?
See http://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/ucs-c220-m3-rack-server/data_sheet_c78-700626.html which has links to both general styles, along with part numbers for various order-able components such as DIMMs, Processors, raid controllers, hard drives, etc.
Thanks,
Kirk...