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Tom Davies wrote:
Apparently the 4Gb Ram limit is a limit of the OS, not the apps.  If the OS can read/write to more ram then i 
don't think the apps would be restricted.  Apparently OSes that are 32bit could read more Ram with a different 
kernel module.  With Gnu&Linux it's possible to swap-in the different module and i kept being  told that 
"it's really easy".  Something like the pae-something module.
With PAE, the 32 bit CPU can access more that 4 GB, but Microsoft still limits Windows to 4 GB. With Linux, no there is no such artificial limitation. IIRC, applications are still limited to 4 GB, as they don't know how to access more, but the OS can use the greater space and make it available to the apps. With Linux, recently used stuff is retained in memory, so that accessing it again is quick. It will eventually be moved to swap, if not recently used. So, with Linux, the more memory available, including beyond 4 GB, the faster the system in general runs.

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