Thought it would be good to capture the system requirements for SharePoint 2012 Preview. This is bare minimum hardware requirement.
Hardware Requirements (Minimum)
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Processor
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64 bit , 4 cores
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RAM
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8 GB for Production Use
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4 GB for Developer or Evaluation use
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Hard Disk
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80 GB free for system drive ( maintain 2x free space as available RAM)
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Database Servers
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Processor
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64 bit , 4 cores for small deployment
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64 bit, 8 cores medium deployment
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RAM
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8 GB for Small deployments
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16 GB for Medium Deployment
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Hard Drive
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80 GB for System Drive
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Hard Disk space is dependent on the size of your SharePoint Content
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Software Requirements
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Database Servers
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64 bit SQL Server R2 – Service Pack 1
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64 bit SQL Server 2012 RTM not Release Candidate
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Operating System
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64 bit of Windows 2008 R2 Service Pack 1 , Windows Server 2012
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Web and Application Servers
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64 bit Windows 2008 R2 Service Pack 1 , Windows Server 2012
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Installation Prerequisites
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· Microsoft .NET Framework 4.5
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· Windows Management Framework 3.0 (CTP2)
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· Application Server Role, Web Server (IIS) Role
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· Microsoft SQL Server 2008 R2 SP1 Native Client
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· Windows Identity Foundation (KB974405)
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· Microsoft Sync Framework Runtime v1.0 SP1 (x64)
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· Windows Server AppFabric
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· Microsoft Identity Extensions
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· Microsoft Information Protection and Control Client
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· Microsoft WCF Data Services 5.0
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· Cumulative Update Package 1 for Microsoft AppFabric 1.1 for Windows Server (KB2671763)
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This is just a starting point in terms of understanding hardware, software, database server requirements. Based on the client requirement or business objective capacity planning will help in determining the farm infrastructure. I don’t think no farm size is perfect changes are bound to happen depending upon the requirement but having some roadmap plan will help in a long run.
For more information, please refer to relevant TechNet article
For a basic complete SharePoint install, here are the steps along with screenshots