Best seems to be HCI Memtest Pro, however, I think for beginner, MemTest64 is more user friendly...
Please let us know RAM model so we can give some suggestions.
Sorry forgot to mention which ram i have 😛
G.Skill Trident Z RGB 3600mhz (F4-3600C16D-16GTZR) with CL 16-16-16-36
2x8 gb (16gb total)