Question Why my RAM is not working?

[prakhars962]

I have MSI X299 SLI PLUS (MS-7A93). The board supports the following memory:

https://imgur.com/PpmCKxQ

View: https://imgur.com/PpmCKxQ


The board has 2 * 8GB HyperX DDR4 RAM. I wanted to increase the memory. Fortunately I had spare 4*16 GB ECC Samsung DDR4 RAM. When I insert the RAM modules it gives me error code 55 on the LED display, which is the memory error. I tested the RAM on another motherboard, it works fine. A different DDR4 RAM in the same slot of the MSI motherboard is not working. Why is that?

I found that the only difference is that the HyperX RAM supports XMP overclocking but isn't ECC and the Samsung RAM is just the opposite. Is that a problem?

I know these Crucial RAM will work if I buy them. Just wanted to know why the RAM sticks I already have isn't working?

 

[Ralston18]

Per physically numbered Page 30 of the linked motherboard User Manual:

"Always insert a memory module in the DIMMC1 slot first "

Also check the other "importants".

And do be sure to check www.msi.com for updated memory information per Page 6.

Hopefully just some error of omission or commission.

 

[prakhars962]

As I said, I just swapped the RAM sticks. The slot is same, if the old one works the new one should work in the same slot. I double checked the slot is DIMMC1 indeed.