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DDR2 2x2048MB on BIOS = 2048MB on Win7 Pro 32-bit?

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March 30, 2011 7:04:17 AM

Greetings,

Recently, I just upgraded my other components so my rig is
* Intel C2Q Q6600 @ 2.4GHz
* DFI Infinity 975X/G with the latest BIOS 10/12/2007
* Corsair TWIN DDR2 2x2048MB PC6400 CM2X2048-6400C5
* Zotac GTS 450 AMP 1GB DDR5

My previous memory was 2x1024MB and already installed Win 7 Pro 32-bit. With the latest BIOS from DFI, it is stated that support 4x2GB of total DDR2. The POST also stated that the memory is already 4GB.

But, the problem is occurred when I install new DDR2 2x2GB. Windows 7 Pro 32-bit only detect them as 2GB total memory only. Displayed on
* System Properties as Installed RAM 2.00GB;
* and also Windows Task Manager show Physical Memory is only 2046MB.
* any other benchmarking tools from FutureMark show 2GB installed memory.

The interesting things are:
* BIOS said that it already 4GB
* CPU-Z 1.48 stated also Dual Channel 4096MB with SPD 2x2048MB.

As far as I remember, Windows 7 Pro 32-bit has memory limitation to 4GB right? http://msdn.microsoft.com/en-us/library/aa366778%28v=vs...

I already tried as follows:
* move them to another slots
* in msconfig, I already ensure that on Boot > Advances Options, the "Maximum Memory" is not ticked.
* googling, and found the same problem but no work around on it

Does anyone know this issue? Should I re-install the system just because I add the new memory? Or should I migrate to 64-bit?

Thanks.
a b } Memory
March 30, 2011 7:47:35 AM

That is caused by a few things. x86 can only detect a TOTAL of 4gb, that includes your graphics card and other stuff too. Just go to 64bit.
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March 30, 2011 9:58:40 AM

violentlyhappy91 said:
That is caused by a few things. x86 can only detect a TOTAL of 4gb, that includes your graphics card and other stuff too. Just go to 64bit.


Thanks for reply. I also expecting my Win 7 Pro will detect 2x2GB as an installed RAM as much as 4GB also. But, it's not, I've turned off any other things on my Motherboard that consuming DDR2 Main Memory. As you may notice that my VGA card is PCI-Express 16x that has its own memory DDR5 1GB. I'm afraid that when I buy another Win7 Pro 64bit, the problem still persist.
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a b } Memory
March 30, 2011 10:18:25 AM

Well, generally, windows can only detect things like RAM once. If CPU-z is detecting 4, and your bios is detecting 4, you have 4. Installing a 64-bit OS is still recommended though, because your OS will actually be able to use all your RAM correctly.
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March 30, 2011 11:02:54 AM

violentlyhappy91 said:
Well, generally, windows can only detect things like RAM once. If CPU-z is detecting 4, and your bios is detecting 4, you have 4. Installing a 64-bit OS is still recommended though, because your OS will actually be able to use all your RAM correctly.


I still can't determine which part is wrong. I just went back to the store and they let me use their other memory.
4x1GB --> BIOS: 4GB, Win7: 2GB
1x2GB --> BIOS: 2GB, Win7: 2GB
4x2GB --> BIOS: 8GB, win7: 4GB (3GB can be used)

It seems that Win7 does re-read Memory configuration. But I don't know why it only read 2GB.
I'll try another version of Win7...

Meanwhile, does anybody know what's wrong with that Fact?
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Best solution

a b } Memory
March 30, 2011 11:33:23 PM

Go with a 64-bit install, it'll help when you get more RAM anyway.
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April 1, 2011 1:56:38 AM

violentlyhappy91 said:
Go with a 64-bit install, it'll help when you get more RAM anyway.


yeah, I should have done it before :)  waiting for another $200 for win 7 ultimate FPP :na: 

now my win 7 pro 32bit getting crashed after hacking its kernel to support RAM up to 128GB :non:  no benchmarking tools can complete their tasks.

Thanks :) 
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April 12, 2011 2:26:47 AM

Best answer selected by tintinmcleod.
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