Can anyone tell which series of intel xeon quad processor provides best scalability and performance to host windows 2003, also what can be the max RAM size which can be configured with it for optimizing compatibility and its effeciency??
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Depends what you will be using the server for and will you be using 32 bit or 64 bit? Depending on the version of Windows Server 2003 you will be using it ranges from as little as 2 GB of memory all the way up to 64GB of memory.
Windows 2003 Enterprise 32-bit or 64-bit? 5500 Series processors are the best, but the Hexacore 5600 Series isn't much more expensive. The maximum memory size per processor is 144 GB, but most dual processor motherboards have a RAM limit of 192 GB or less.