Question I upgraded my computer and now it's very slow

[Juxingmoves]

I recently upgraded my computer from r5 3600 to r5 7600. Everything seemed fine, it booted up to my drives and I couldn't help but notice that it was having a hard time opening File Explorer and opening Discord was taking ages. I opened HWmonitor and saw that my CPU was running at 500mhz idle at 0.5v. I tried opening valorant and it 20 min just to open and while opening it was still stuck at 500mhz.
I tried everything from resetting bios to even setting the voltage of the CPU to 1 but it didn't work it was still running at 500mhz.

The only thing that I see that may have been the cause is the CPU pins to the motherboard. My PSU only has 8 pins to CPU however the new motherboard has 12 pins to the CPU. I looked it up and it says it should be fine only using 8 pins to the CPU power.

I asked my friend about this situation and he said it might be the RAM but I really don't know.
It might be my PSU just needing extra 4 pins to power my CPU or my motherboard is faulty or my RAM timing according to my friend.

here are my parts:
ASUS TUF b650M - plus wifi
R5 7600
DDR5 Corsair RAM 2x32 32-40-40-84
RTX 2060

 

[punkncat]

Did you download and install the chipset drivers and other such from the motherboard manufacturers website?

Was this a clean install of OS, or did you just take the drive from the old one and put in the new one?

 

[SkyNetRising]

I opened HWmonitor and saw that my CPU was running at 500mhz idle at 0.5v. I tried opening valorant and it 20 min just to open and while opening it was still stuck at 500mhz.

You changed motherboard?
Then reinstall windows.

Check, if cpu cooler is properly installed.
If it isn't , then cpu will overheat and run at lowered speed.

And connect both CPU 12V connectors (4pin and 8pin) to motherboard.

What model PSU are you using?

 

[Order 66]

What are the temps? If the temps are too high the CPU will thermal throttle until the temp drops to safe levels. With that said it shouldn't be throttling to 500Mhz.