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I recently installed FC6 on my new Dell 2650, with Dual Xeon 2.4's, 8GB DDR ECC RAM, 5x36.4GB SCSI Hard drives. Now FC6 is only registering 3.6GB of that RAM, in BIOS setup, it say's there is 8192mb which is correct, anyone got any idea's why FC6 isn't registering the 8GB RAM?
It is the cause of PAE (http://en.wikipedia.org/wiki/Physical_Address_Extension) when a 32-bit OS is trying to use 4 GB or more of memory. With out PAE, 4 GB can be allocated by a 32-bit OS and processor with out virtual memory getting in the way. If you use a 64-bit OS, all 8 GB of RAM will be used. Though Linux is a virtual memory OS, so it will use some memory for system (kernel) related tasks. In the kernel, you have choice of 3GB/1GB, 2GB/2GB, or 1GB/3GB. The kernel documentation has more on this topic.