Thanks PaulFowler for your inputs. For other developers/experts, hope you can continue to share your thoughts.
We have consulted our previous OPA trainor as well on what are the Hardware requirements for the OPA server, but said unfortunately there doesn't seem to be any document to that level of detail. They're not aware of any technical documentation on this topic other than the System requirements. However they advised it is worth re-posting this topic again to the development teams out there to confirm.