my computer reads 48gb on start but restart after warm up reads 64gb

hensleywl7

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Jan 30, 2014
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10,510
i have a core I7 3930 asus x79 saber tooth motherboard 64 GB Kingston 1600 mhz ram corsair 1200 axi power supply gtx 590 graphics card but only read 48 GB on cold start up and 64 GB on warm restart. running windows 7 ultimate
 

I understand that you now are happy, but Windows 7 should detect the same memory size when the system is cold or hot. You need to understand that CPU-Z will display all installed memory even if there are issues with a module and the OS can't use it.
 
It could be an issue with a connection between the processor and the socket where contact is fully made once the CPU has warmed up. Have you searched for similar issues and found threads like this? http://www.tomshardware.com/forum/317545-30-asus-sabertooth-memory-issue

You could also remove 2 modules, let the system cool off for a couple hours (or overnight) to see if both modules are detected. If they are, then follow the same procedure with the other modules. You need to identify if the issue occurs with a memory module or a memory slot.