Question CPU problem with temperature on new board.

[quadrax]

Hey there.

I have a problem and can't figure it out. Problem is - CPU overheating (even if i undervolt = 60°C idle and light load like firefox i am hitting 70°C.

I bought 3 days ago, new motherboard ASUS B650E plus Wifi and this never occurs before on my secondary board - crosshair hero.

I´ve tried reset CMOS, manually set everything (disabled saving features, etc...) and still getting those horrible temperature.
I´ve also tried other AM5 CPU (same model) and it behaviour same as my new AM5 CPU.

Because of this problem i had Arctic Cooling Liequid Freezer cooler, which i suspect there could be a problem with pump, but no,... so i bought MSI MAG Coreliquid A13 and problem still persist.

Hopefully i can find a fix or i dont know what would to do.

Anyway specs pc are :

CPU : AMD Ryzen 9 9950X3D
MB : ASUS B650E-Plus Wifi
RAM : 2x Kingston Fury 96GB, 6000MHz
SSD: 1x Samsung 2TB 9100Pro, 1x Crucial 500GB, 1x Samsung 990 Pro 4TB.
PSU : Corsair RM1000x
GPU : Palit Geforce RTX 5070

 

[Lutfij]

I bought 3 days ago, new motherboard ASUS B650E plus Wifi and this never occurs before on my secondary board - crosshair hero.

ROG CROSSHAIR X670E HERO | ROG Crosshair | Gaming motherboards｜ROG - Republic of Gamers｜ROG Global

Designed for the broadest range of demanding fans, the ROG Crosshair X670E Hero features 18 + 2 power stages, DDR5 support, up to five M.2 slots, a USB 3.2 Gen 2x2 front-panel connector with Quick Charge 4+ Support, dual USB4®, PCIe 5.0 and onboard Wi-Fi 6E

rog.asus.com

Was this your older board? If so, you performed a downgrade compared to the ROG board. What BIOS version are you on for your latter Asus motherboard? That being said, did you reinstall the OS after the motherboard swap?

 

[Aeacus]

Problem is - CPU overheating (even if i undervolt = 60°C idle and light load like firefox i am hitting 70°C.

Unless your CPU temp goes 95C or more (Tjmax for your CPU), your CPU is not overheating.

I bought 3 days ago, new motherboard ASUS B650E plus Wifi and this never occurs before on my secondary board - crosshair hero.

Which Crosshair Hero? X670E or X870E?

But it matters not, since both have 18+2+2 VRM configuration rated for 110A.
While your "new" B650E Plus Wifi has 12+2+1 VRM configuration rated for 80A.

Since you had solid downgrade in VRMs and you're running Ryzen 9 chip, it is reasonable that it now runs hotter since it has less VRM phases to work with, with lesser rating.

 

[JayGau]

I´ve also tried other AM5 CPU (same model) and it behaviour same as my new AM5 CPU.

It's very confusing. Did you only replace the motherboard or also the CPU? As Lutfij and Aeacus said, if your crosshair hero was an AM5 you got a massive downgrade.

And even if you moved from the AM4 to the AM5 platform, pairing a 9950X3D with a low-end b650 board is not a good idea (unlike what some youtubers like jaytwocents pretend). A high-end CPU should be paired with a high-end board to get the max of it. With this board your Ryzen 9 might reach its max temp very quickly under significant load like gaming and throttle down, giving you less performance than it should.