RAM Limitation Windows Server 2008 for x86 & x64

x86
4GB for Standard and Web Edition
64GB for Enterprise and Data Center Edition
x64
32GB for Standard and Web Edition
2TB for Enterprise, Data Center Edition, Itanium-based

Router Memory

RAM: The RAM stores the OS, running config file, IP routing table, Arp cache and packet buffer

ROM: Permanent storage – Scaled down version of IOS, Basic software

Flash Memory: Permanent storage of for OS, Cisco IOS

NVRAM: Used as permanent storage for startup config files.

If start up config is not found in the RAM memory what does it do ?

It searches the NVRAM where all the it is permanently stored!