Why is only 2.73 Gb of RAM usable on a 4 Gb RAM MacBook on Windows 7 32 bit

I understand that with the video card (which is 256 mb of dedicated RAM on this model) I should have ~3GB of RAM usable on 32 bit version of windows 7. (Yes it is legal, which seems to be the first question in this discussion)
Is there something else in the equation that I am missing?
1. 32-bit only applies to RAM over 4 gb and since this is bootcamp, it is not running another operating system.
2. Unless there is something within the hardware of my macbook that is only able to use 3 Gb I apologize for my ignorance, it's not really a serious issue but I could almost swear that I had more memory usable on my windows 7 partition at one point in time.
Thanks in advance

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Only 2GB RAM working in Windows 7 64-bit

Hi there,
We have a 2x 3.2Ghz Quad-Core Mac Pro with 12GB DDR2 800 PC2 6400 (iRAM IR4GMP800K), running Snow Leopard 10.6.4 and Boot Camp updated to 3.1. All 12GB of RAM show up just fine in Snow Leopard.
We just installed a new 1TB SATA drive, created a Boot Camp partition, and installed Windows 7 64-bit on it.
Installation went fine, and the OS seems to run okay. However, only 2GB are showing up in the System Properties. It does name the OS as Windows 7 64-bit.
We tried to install the 64-bit drivers in the Boot Camp / Drivers / Apple folder on the Snow Leopard DVD, but didn't seem to help.
Any ideas?

Yes, purchased it retail. This is exactly what we bought and the disc that was installed:
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116758
I was thinking about the actual RAM too. When we installed the iRAM, we pulled the 4GB stock Apple RAM. I can try to put that back in tomorrow I suppose, and see what happens.
Also worth noting the ram is installed as such:
Board A: 4 x 2GB modules
Board B: 2 x 2GB modules
Do you think the slots we used might have something to do with it?

Why use only 3gb ram when instaled 4 gb?

why use only 3gb ram when instaled 4 gb??
macbook 2,1 late 2007 mac os 10.6.8
Название модели:    MacBook
      MacBook2,1
      Intel Core 2 Duo    2.16 ГГц
RAM:   4 ГБ 667 МГц
Версия Boot ROM:    MB21.00A5.B07
Версия SMC (система):    1.17f0
    UUID     00000000-0000-1000-8000-001B6335F21C
< Edited by Host >

already read the threads about memory limitations,
the snow leopard limitation has not been withdrawn, and the Mac OS Lion restriction will be removed? or not?

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RealGeorgeW wrote:
I would have to agree that almost all computers right now are shipping with 64bit OS's installed on them.
Unfortunately, most of the spec sheets on the website are prepared by the manufacturer, so discrepancies are on them to send updated info to BBY to fix.
That being said, I do vaguely recall a machine I had that only had a 32bit version of windows installed, but correctly identified 8GB of RAM. That was a while ago, I wish I could remember how/why it worked.
I recently built a new system and accidentally installed Windows 7 32-bit. For some reason the operating system was able to detect my 8GB of RAM, which was part of the reason why I didn't realize I had installed the wrong OS for several hours. After doing some research on this puzzling issue, I learned my motherboard may have had some special capability to override the 32-bit limitation or something.
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I added a few screen shots for somebody to see. Please help.
Message Edited by Zhelkus on 03-11-2009 06:26 PM

More reviewing...your model Graphics8• Dual NVIDIA® GeForce® 9800M GTS graphics with NVIDIA® SLI®Technology 512MBx2, GDDR3 discrete graphics memory, plus up to
1663MB dynamically allocated shared graphics memory using
NVIDIA® TurboCache™ technology.o Total Available Graphics memory 2175MB
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Why is my 8 gigs of ram not fully usable on a Windows 7 64-bit system with an HP G42?

The title contains most of the details, but to re-explain briefly, I recently installed two 4 gig sticks of ram in my HP G42-415DX. The full 8 gigs shows as installed, but only 3.74 gigs is showing as usable. I have verified that I have a Windows 7 64-bit system (Home Premium to be exact), and I have recently updated drivers (at least I'm sure I've updated all the drivers, but it is possible for one or two utility type drivers not being installed) to try to solve the problem, to no avail.
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Hi:
See if this works...
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Why is only 2.73 Gb of RAM usable on a 4 Gb RAM MacBook on Windows 7 32 bit

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