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
had to wait till morning cold start but win 7 read 48gb and cpu z read 64gb thanks
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.
i changed out the ram but still had the same problem i can tell a difference in speed when it reads 48gb on my unigine but don't know how to fix it thanks for your help
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.