My rig -->
showed only 63.4GB usable. is it normal?
System limitation
It is due to the OS that does not fully recognize the full 64GB memory.
Normal answer: Yes, that is normal. Some RAM of the total installed will be "reserved"
Honest answer: 600MB of 65,536MB cannot use still complain
EDMW answer: Haolian thread spotted![]()
its due to the OS. normal lah
create your own OS.. lolz.

not that im complaining. cos i google here, memory support suppose to be higher at 192gb. so 64gb cannot use 64gb just wanna know why lor....
nothing to hao lian also... not that its very expensive rig like the elite here
Memory Limits for Windows Releases (Windows)
i see... then shouldn't it suppose 64gb usable thenWindows 7 Professional limits up to 192 GB of physical memory but if I am not wrong your X79 motherboard only supports up to 64 GB of physical memory.
?i see... then shouldn't it suppose 64gb usable then?
i guess as long its working fine, then should be ok ba...
cant find much info about it...
"When the physical RAM that is installed on a computer equals the address space that is supported by the chipset, the total system memory that is available to the operating system is always less than the physical RAM that is installed.
For example, consider a computer that has an Intel 975X chipset that supports 8 GB of address space. If you install 8 GB of RAM, the system memory that is available to the operating system will be reduced by the PCI configuration requirements. In this example, PCI configuration requirements reduce the memory that is available to the operating system by an amount that is between approximately 200 MB and approximately 1 GB. The reduction depends on the configuration. "