canonkong

@Dietmar Yes, here is the file. CPU Show.7z Original BIOS ACPI table dump:https://disk.yandex.ru/d/75Fwkvp1MmTIcA MOD BIOS ACPI table dump:https://disk.yandex.ru/d/oI9KAZEtugvrWw

@Dietmar Benchmark tests results were all right. I test few B550 and B650 mainbords, all are working fine. Single core frequency and multi-core frequency turbo, standby power and fullload power consumption，CPU thread scheduling are all right.

Modify the BIOS also can solve this CPU problem. The new motherboards usually have the BIOS flashback function, can flash the mod bios very easy.

@Damnation And I don't think ACPI\ACPI0010 is Processors device. Testing on NTOS 6.2.7962 .

@Damnation Maybe AMI force to make this.

@Damnation I had tried it, but I can not find any other device need to install driver.

I modified the CPU driver and install it. But only show one processor. Modify the *.inf file and add this line: %AmdPPM.DeviceDesc% = AmdPPM_Inst,ACPI\ACPI0010

@Damnation After update the latest bios, I found ACPI\ACPI0010 which names Generic Bus in system device.

@Damnation I can't find any systems with this ACPI0010 Device on my Gigabyte B550I AORUS PRO AX.

@daniel_k So I need to modify the bios to fix it？AMD A520/B550 mainboards’ FCH is from ASMedia, same with AMD 300/400 series. I think can use B450 mainboards’ professor related code. But how to make sure this code?

Processor devices do not appear in hardware management, which usually occurs on AMD's a520/b550 motherboard and Intel's 600 series motherboard. This situation occurs from XP to win7. It will be work well from win8 beta 6.2.79xx or above. I tested 6.2.7880 and will not display it. I tested 6.2.7973 and can display it. I tried to replace modified acpi.sys with the old version, but Win7/beta7880 still doesn't display. Maybe my mod acpi.sys modification is incorrect. Mod BIOS may be fixed..

I had tried to port the win8.1 usb driver on win7, but failed. WIN8.1 usb driver need kmdf 1.13.