Question C5 error code on x670e aorus master

[robert_21]

Hey so I just changed my cpu from the ryzen 9 7900x with ram in slotz a2&b2,

to the ryzen 7 7800 x3d.

now I get the c5 error if I have my ram cmh64gx5m2b6000z40 kit, in slots a2 and b2 I get the error and cannot even get to bios.

If I use one stick of ram it boots fine and if I put both ram sticks in slots a1&a2 it also boots fine


any ideas what the fix is?

I have flashed and installed the latest bios.

 

[Lutfij]

What BIOS version are you currently on for your motherboard? As for the BIOS, did you clear the CMOS after you'd verified that the BIOS was flashed successfully? How are you cooling the processor?

 

[robert_21]

Hi latest bios version think it's f22b and cleared cmos using the jumper. Cooling wise is a nzxt z3 kraken temps show around 60c

 

[robert_21]

Tried different ram sticks still same error it will run if I put one stick in but won't with 2