Choosing a CPU

So I recently bought a new set of ram which is KLEVV Bolt X 2x8 3200Mhz DDR4, so I thought it will go well with my MSI A320M GRENADE and r3 1200, but somehow I guess the r3 1200 isn't capable for 3200Mhz with non-samsung b die sticks. So now I'm thinking of buying a new CPU instead because its...

Hi there, I am building a pc. since my parents are paying for this pc I wanna get most out of it. where I live pc parts are bit expensive than the USA. so I'm right now confused between Rzen 5 or Intel i5 9400f. I need the pc to do a lot of multitasking and also 144hz gaming(80+ fps) in 1080p...