Exchange 2010 - Processor Cores, Roles etc.

I have a quick question here i am reviewing some requirements for Exchange 2010 and wanted to make sure i was clear on the following link:

http://technet.microsoft.com/en-us/library/dd346701%28v=exchg.141%29.aspx

Recommended processor core ratio based on server role configuration
Server role configuration       Recommended processor core ratio

Mailbox:Hub Transport
      

7:1 (no antivirus scanning on Hub Transport server)

5:1 (with antivirus scanning on Hub Transport server)

Mailbox:Client Access
      

4:3



I dont understand the ratios.

Where it says 4:3 for mailbox : client access does that mean that to be properly sized based on this example that if i have 4 CPU Cores, i would need to have 3 Client Access Cores?
LVL 6
castellansolutionsAsked:
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David CarrConnect With a Mentor Commented:
I would also recommend using the Exchange Server 2010 Role Calculator at http://gallery.technet.microsoft.com/Exchange-2010-Mailbox-Server-Role-/ 

This will give you specific numbers based on your environment
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Pradeep DubeyConsultantCommented:
read the below link you will understand these ratio :

http://technet.microsoft.com/en-us/library/dd346699(v=exchg.141).aspx
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castellansolutionsAuthor Commented:
I was hoping for an actual explanation of the ratios thats where i am confused i already read that link but am still unclear. Please provide an explanation. thanks
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AmitConnect With a Mentor IT ArchitectCommented:
castellansolutions

The article you posted is talking about the server role ratio requirement recommendation. Example:

If you have 4 Mailbox Role servers, you should deploy atleast 3 CAS role servers, which means 4:3 ratio, however it again depends on user volume.
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