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Why is Windows 7 usable RAM less than installed?

I've just installed 24GB RAM. BIOS sees all 24GB, and so does Windows 7 Home Premium 64bit, but as you can see in the attached grab, Win 7 is only reporting 16GB as usable. My board doesn't appear to have a memory remapping setting in BIOS, or at least I can't locate one. 'Maximum memory' is unchecked in Advanced Boot Options in Win7.

Windows 7 Home Premium 64bit
Asus P6X58D-PREMIUM with latest BIOS
 Intel Core i7-930
nVidia Quadro 4000
G.Skill  F3-12800CL7T-12GBTDD x 2 for 24GB
 Sceen capture
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Steve Brame
Asked:
Steve Brame
1 Solution
 
Lee W, MVPTechnology and Business Process AdvisorCommented:
I believe that's because Win7 Home premium is licensed for a maximum of 16 GB.  IF you want more, you need to upgrade to Pro or Ultimate.
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Steve BrameRich Media DirectorAuthor Commented:
I wish today was April 1st and you were joking....
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Lee W, MVPTechnology and Business Process AdvisorCommented:
See the section titled
Physical Memory Limits: Windows 7
http://msdn.microsoft.com/en-us/library/aa366778(VS.85).aspx
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DonConsolioCommented:
http://msdn.microsoft.com/en-us/library/aa366778%28VS.85%29.aspx

Version      Windows 7 Home Premium      
Limit in 32-bit Windows 4 GB      
Limit in 64-bit Windows 16 GB
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You can always use the Windows Anytime Upgrade to buy an upgrade to Pro.
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Steve BrameRich Media DirectorAuthor Commented:
Guess I will....thanks all!
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mds-cosCommented:
Before you upgrade, you might want to step back and consider if you really need all of that memory.  Are you doing stuff like serious 3D CAD graphics rendering for very large objects?   If so, you might actually tap into that memory.

But if you are just using that system for normal stuff, even high-end gaming, you are unlikely to consume even 16Gb of RAM.

Just my $.02....
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