Re: AsRock 970 Pro3 freezing
Hello and Welcome.
Have no fear. Your English is just fine.
My guess is clearing the CMOS is probably responsible for the "current' stability what with you implying "for now is good".
I have to go with that as you don't say what steps were followed at the time you switched the memory. So on just what you typed above the clearing most likely let the BIOS properly configure the new memory to its specs instead of running the the new memory at the old memory's specs.
Mine: ASRock Z77 Extreme6, i7-3770K, 16GB Samsung MV-3V4G3D/US, SeaSonic X-750 Gold, On-die HD 4000, Corsair H80i, Antec Spot Cool, Fractal Design R4 Black Pearl w/Window
Hers: ASRock 990FX Extreme4, FX-8150, 32GB AMD/Patriot AE316G1601U2K, SeaSonic X-750 Gold, Asus HD7770-2GD5, Corsair H80i, Antec Spot Cool, Fractal Design R4 Black Pearl w/Window
Server: Gigabyte GA-990FXA-UD5, FX-4170, 32GB AMD/Patriot AE316G1601U2K, Enermax ELT500AWT, IBM ServeRAID M1015, Sapphire Ultimate HD 4670, Norco RPC-470