EV 10 Sizing for 8000 Mailboxes

Hi,

We are on EV 9.0.3 32bit OS for Vault Server and archiving 8000 mailboxes from 2 x Exchange 2010 DAG groups which runs pretty slow at the moment.

We are planning to migrate to EV 10.0.3 on 64bit OS for Vault (2008 R2) and virtualize EV Server usign VMWare ESX.

If we get 32GB Memory and 8 CPU cores, would that be good enough for archiving 8000 mailboxes or would you recommend to split EV into two EV servers and slipt the laod?

Please suggest

Many Thanks