DP 8.12 and HP DL-380 Cell Manager

We are in the process of setting up two new HP DL-380 cell managers, one as a MoM/CMMDB server with zero clients. 

We are setting up the other DL-380  to accept all 1,400+ servers that we currently back up nightly. 

The new cell managers currently have 64Gb of RAM, a team of 10Gb 2-port 560SFP+ Adapter NIC's along with four other 1Gb NIC's that are teamed. 

We were curious to know if the one DP 8.12 cell manager would have enough throughput to handle all the backups and what that backup window would look like.  We are writing all backup data to a combination of VTL's and Catalyst stores on a maxed out B6200 configuration.  We cannot have a 24 hour backup window because we will also be replicating deduped data to a B4900 over a single 1Gb line.

Based on HP's assumption that DP 8.12 can handle 5,000 servers on a single cell manager.

1. Does anyone know if this configuration would be overloaded? 
2. Should we add more RAM to each server or to the one handling the backup throughput?
3. Any other concerns?

Any suggestions or advice would be deemed helpful.

Thanks!