This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Are you asking if part of your job in architecting the solution is to recommend hardware?
It's up to you. But I don't think it's your role to suggest hardware to the client. Remember, showing too much detail can indicate that you're not sure about your solution or where to focus your energy.