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Old 10th November 2010 | 17:25
  #14 (permalink)  
MG23
 
Joined: Jun 2009
Posts: 463
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From: Canada
Originally Posted by Mike-Bracknell
Comparison of 32-bit and 64-bit memory architecture for 64-bit editions of Windows XP and Windows Server 2003

Check the section "System PTEs". It's 4Gb made up of 2Gb User and 2Gb Kernel.
Yeah, but it also says: "Applications that are compiled with the /LARGEADDRESSAWARE option, as would be required to take advantage of the /3GB switch in 32-bit Windows, will automatically be able to address 4 GB of virtual memory without any boot time switches or changes to x64 Windows. Plus, of course, the operating system does not have to share that 4 GB of space. Therefore, it is not constrained at all" So it's pretty inconsistent.

Everything else I've read about the LARGEADDRESSAWARE flag says the same, that it allows you to use up to 4GB of RAM without the OS taking any of it... and the fact that some games crash when it's set tends to imply that's the real behaviour too .
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