why cpu cores sleep

[maroammar]

hello

 i have ryzen 3700x and somtimes my pc lagging

I OPEN RYZEN MASTER AND FOUND ALOT OF CORES SLEEP 

[Kilrah]

Becasue your system is idle, look at it while under load...

[Levent]

Not every core is needed all the time. Its trying to conserve power, and helps to remove greta thunberg off your nightmares.

[Mark Kaine]

Um. My Ryzen never sleeps while gaming.   it's kind of like all cores run at very similar speeds under load,  all the time. 

 

Edit: I misread lol. Well if the PC is idling that certainly is normal that the cores sleep.  It's a feature, of all modern CPUs I would hope.

[jadey]

Bump. 
Just got my new computer yesterday. Getting the same readings. I understand if it's not currently gaming it doesn't need to use all the cores, but them being asleep, does this explain why it is lagging? If so, how can I make them not sleep so that the lagging stops? 
My system is fresh, brand new and still lagging. I've been trying update drivers (with not a lot of success as my computer did not come with a CD drive) and it's driving me insane. 
 

Windows 10
MPG X570 Gaming Edge Wifi motherboard
Ryzen 7 3700x Processor
Nvidia Geforce GTX 1660 super graphics card 
sx8200 pro 256Gb ssd (running OS Windows 10) 

**Update** Changing setting in the BIOS from RAID to AHCI seems to have helped.... would like opinion on this. In the event the problem persists, what else could I try? 
(Please keep in mind, this is a FRESH install. I have nothing on my computer except for one song to test sound/lag and these monitoring programs to detect the lag)