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Why can I only use 2.48 GB RAM in Boot Camp (Win 8.1 Pro, 64-bit)?

Hello, I am fairly new to the iMac and I have to use some programs in Windows that are not available for Mac so I set up Boot Camp and installed Windows 8.1.


My iMac is a I7-2600 CPU @ 3.4GHz with 16 GB RAM, system type-bit. Under system in Windows it shows Installed memory (RAM) 16 GB (2.48 GB usable).


I read about this problem and most answers are related to people using 32-bit. So what is wrong in my case, where is the problem?


Thank you in advance for help and suggestions.

iMac, OS X Yosemite (10.10.3)

Posted on May 3, 2015 11:52 AM

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195 replies

Jun 19, 2015 3:31 PM in response to Loner T

I had the same idea, I tried 3 different USB sticks. The most promising suggestion to me is still the small boot partition on the internal hard drive - when you suggested that you said I should format it fat32 or exfat - today when we were talking about the USB sticks you said NTFS - so was it wrong to format the small boot partition with fat? (Though I'm almost sure I tried NTFS just out of curiosity)

Why can I only use 2.48 GB RAM in Boot Camp (Win 8.1 Pro, 64-bit)?

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