NotSoSmallDavid

After consistent tests, I have come to believe that one of my DIMM slots dont work. My system wont post with a stick in the fourth slot. When populated in slots 2 & 4 it only allows for 8gb to be used. when slots 1 & 2 are populated the system boots and allows for the full16Gb to be used, however this does not allow me to take advantage of dual channel.

heres a proper picture of my bios, I may have used the thumbnail for the upload image in my other message

I have since put both sticks in the same channel to take advantage of the 16GB instead of 'dual channel' with only one usable stick

Yeah they're exactly the same as eachother

I have 2* 8GB sticks properly populated in the correct DIMM slots to take advantage of dual channel and I've flashed my BIOS already

Any help would be much appreciated

It states that only 8gb is physical memory and the L3 Cache size is 16GB?

It just tells me that 8GB is reserved?

Yea, each ram stick works fine on its own. I should also mention i have 2x 8GB sticks and when only 1 ram stick is present in hte MOBO, it saysthere is 8GB Recognised but only 4GB available. It seems that it is reserving half the available RAM for some reason

It's a Ryzen 7 2700x on a B450M Gaming Plus Max Motherboard

Ive followed a few tutorials that involve me opening MSConfig and updating my BIOS. I've even moved my ram sticks to different slots to find I have the same problem. Any ideas would be great!