Bootcamp (Windows) not using all available memory

G

GrBear

Registered
Here's an odd one.. I have a Mac Pro (2x dual core) with 4x512MB and 4x1024MB FB-Dimms (6 gigs ram total). Mac OS X recognizes it as 6 gigs, Windows (under boot camp) only says I have 2 gigs both under XP and Vista.

The memory is installed correctly (as in 2x512MB in slot 1 & 2 and 2x1024MB in slots 3 & 4) on both ram boards.

I did a quick Google on this and couldn't find an answer.

edit: eh, guess it's time to update my sig.. blah..
 
Hm. Try the bigger DIMMs in the lower slots, i.e. 2x1024MB in slots 1&2, take the 512MB DIMMs out, just for testing. Then add them...
 
Are you sure it is not only the case of a 32 bit operating system? As Microsoft says:
Operating systems based on Microsoft Windows NT technologies have always provided applications with a flat 32-bit virtual address space that describes 4 gigabytes (GB) of virtual memory. The address space is usually split so that 2 GB of address space is directly accessible to the application and the other 2 GB is only accessible to the Windows executive software.
Click to expand...
 
I swapped the 512MB FB-Dimms and 1GB FB-Dimm positions on the carriers and XP still only reports 2G of free ram.

I gave up on Vista since its a real dogs breakfast.. nothing to see there other than frustration of being treated as a 2yo asking if I really want to do something. Yeah, I know I can turn all that off. I'd rather have implied security rather than being told if you turn off the hand-holding your OS won't be secure anymore.

Still, I use XP for gaming.. Orange Box specifically Portal, while short, would be my favorite game of the year hands down.
 
Apparently it's a combined Apple's BIOS on EFI and Windows issue. Either way: I'd take a look at it again when running Leopard etc. Maybe they've fixed the problem but aren't updating BC for Tiger anymore.
 
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