2.8是正常可用的，
你清一下CMOS看看，
再不行就换个方法升级一下BIOS，UEFI或IPMI换着试一下
升级完成，一定不能关机，要等，等足够时间

内存拓扑中显示这个样子

CPUz可以显示双通道甚至显示每个槽位的内存信息，但是资源管理器中只显示一半容量

逐条插到c通道还是显示内存无效

系统中仍然是cpuz可以识别到内存，但是资源管理器中只有b通道的内存容量

果然第四根插d通道后四通道在cpuz中完整，但是资源管理中只一半内存

我在U盘找到几张以前的截图，
我的主板跟你的应该是一样的，BIOS原始版本是2.4

bios内存设置

@mcubeta ,为啥我的7800x tdp是122w,而你的显示是140w,看起来步进也一样

是这个?@mcubeta

完犊子了，尝试用超微superdoc重刷BIOS后卡3b code了，这是BIOS刷坏了吗

如果开机连F11提示都没有，那就拔掉所有硬盘，把官网的2.8 BIOS文件改名Super.ROM，插入主板，上电，系统会进入恢复模式，参考官方的说明：
Recovery BIOS with an USB Drive
If the BIOS ROM is corrupted and the system is not able to boot up, this feature will allow you to recover the BIOS
image using an USB-attached device. A USB stick or a USB hard disk drive may be used for this purpose. Please
note that the USB CD/DVD ROM drive is NOT supported. Please follow below procedure to recover the BIOS.
1. Use a different system, copy the standard BIOS binary image file into a USB stick or a USB hard disk drive Root Directory, and rename the file to Super.ROM.
2. Insert the USB device that contains the new BIOS image ("Super.ROM") into the USB port and power on the system.
3. After locating the healthy BIOS binary image, the system will enter the BIOS Recovery menu.
4. Select "Proceed with flash update" to start the BIOS recovery process. DO NOT INTERRUPT THIS PROCESS UNTIL IT'S FINISHED!
5. After the Boot Sector Recovery Process is complete, press any key to reboot the system.
6. Boot to the Build-In UEFI Shell, selectable item in boot menu by pressing F11 key during boot up, and type
FLASH.nsh BIOSname#.### to start the BIOS update, just like in standard BIOS update procedure under UEFI Shell.
7. Do not interrupt the process until the BIOS update is complete.
8. After the message indicating BIOS update has completed, do the A/C power cycle.
9. Go to the BIOS configuration, and restore the BIOS setting.

不幸的是，这个做了也没用，我怀疑是刷BIOS把CPU或者主板干坏了，依然卡3B