CONFIGURATION GUIDE – NEC Express5800/R120d-2E Storage-RichNEC Corporation Revision 7.0 – October 25, 2013 16Maximum Available MemorySee the table below for the maximum memory size that you can actually use on your system.The maximum available memory is less than the maximum physical memory supported by your systembecause some chipsets require PCI resource space of about 750MB. PCI resource requirements varydepending on the type and the number of PCI cards you are using.Maximum Memory Size Supported by OS Maximum Available MemoryMicrosoft Windows Server 2003 R2, Standard EditionMicrosoft Windows Server 2008 Standard4 GB 4 GB (HW-DEP enabled)App. 2 GB (HW-DEP disabled)Microsoft Windows Server 2003 R2, Standard x64 EditionMicrosoft Windows Server 2008 Standard (x64) 1Microsoft Windows Server 2008 R2 Standard 132 GB 32 GBMicrosoft Windows Server 2003 R2, Enterprise EditionMicrosoft Windows Server 2008 Enterprise64 GB 64 GBMicrosoft Windows Server 2003 R2, Enterprise x64 EditionMicrosoft Windows Server 2008 Enterprise (x64) 11 TB 384 GBMicrosoft Windows Server 2008 R2 Enterprise 1 2 TB 384 GBMicrosoft Windows Server 2012 Standard 1Microsoft Windows Server 2012 Datacenter 14 TB 384 GBRed Hat Enterprise Linux 5Red Hat Enterprise Linux 616 GB 16 GBRed Hat Enterprise Linux 5 (EM64T) 1 TB 384 GBRed Hat Enterprise Linux 6 (x86_64) 2 TB 384 GBVMware ESX 4.12 256 GB or1 TB256 GB or384 GBVMware ESXi 5.0, 5.1 3 2 TB 384 GBVMware ESXi 5.5 3 4 TB 384 GB1 The maximum available memory size of Hyper-V systems are below:- Windows Server 2008 Standard (x64) and Windows Server 2008 R2 Standard : 32 GB- Windows Server 2008 Enterprise (x64) and Windows Server 2008 R2 Enterprise : 1TB- Windows Server 2012 : 4 TB2 Up to 255 GB of the main memory is available to each virtual machine3 Up to 1 TB of the main memory is available to each virtual machine.