Precision 3630 which ram

@andrzej503650771 

I have included the manual below so you can see the supported RAM configurations for your system model:

Precision 3630 Tower Setup and Specifications Guide | Dell US

that memory 4x MTA8ATF1G64AZ-2G6E1  is part of Aurora R7 validated ram

Y7N41 8GB, 2667MHz, DDR4, 1Gx64, 8K, 288 pin, 1Rx8, Single Rank, Unbuffered, 1.2v, Non-ECC

Micron MTA8ATF1G64AZ-2G6E1

precision 3630 and R7 are from same era so this memory will likely work

Just to add, can not mix ECC with non-ECC memory on the 3630.