Dell Precision 5820 - Max Ram

Hello,

I have a Dell Precision 5820 with an Intel Core i9 14 Core (i9-10940X) 3.30 GHz. I was under the impression that the max ram for this system was 256GB.

I have installed 8 sticks of Micron MTA36ASF4G72PZ-2G6E1 902 32GB PC4-2666V RDIMM into the machine but it does not seem to like it. I get three beeps then two amber lights followed by 5 white lights. Which indicates that the ram is not supported. 

I though that you could use ECC ram with the i9 processor. 

I was wondering if someone could help me figure out if there is a setting that needs changed or if I am just SOL. 

Thanks!