It would be hard to say if you need to make any changes in hardware since we don't know what you're currently running. Luckily, the Network Security Platform (formerly, Intrushield) product line has some of the best documentation in the McAfee family of products. I suggest going to the McAfee Service Portal and searching the KB for documentation. I have used these instructions several times over the years to upgrade Managers to newer versions and if you follow the instructions it goes fairly easy.
You can access the Service Portal here: https://mysupport.mcafee.com/eservice/Default.aspx