[SOLVED] 2 out of 4 RAM slots are dead

[SY3]

So I delivered my pc from another country and Iong story short 2 slots closest to cpu (DIMM_A1 , DIMM_A2) are dead (windows memory diagnostic tool gives error message for these slots, no matter the ram i put in there. Also a lot of crashes tend to happen. My question is: how well will DIMM_B1 and DIMM_B2 work, since they have different colours and not dual channal? They do not give errors from memory diagnostic toll.
My motherboard is B560-M plus from asus.

 

[geofelt]

Intel is not particularly sensitive to ram speed so single channel operation will not be noticed.
Integrated graphics does get better with faster ram.

Defective slots are often caused by a bent pin in the cpu socket.
It is all too easy to do if you do not drop the chip in cleanly.