Just to be clear: are you trying to add the new set of two to the existing set? I.e., 4x8GB?
That can sometimes cause problems due to timing variations between batches. Make sure to memtest each stick individually, to make sure that isn’t the issue.
Edit: just realized that you implied that this setup has been working since 2024, so you can probably ignore my advice here
Just to be clear: are you trying to add the new set of two to the existing set? I.e., 4x8GB?
That can sometimes cause problems due to timing variations between batches. Make sure to memtest each stick individually, to make sure that isn’t the issue.
Edit: just realized that you implied that this setup has been working since 2024, so you can probably ignore my advice here
maximum memory speed is also often slower with 4 modules vs 2.
True, but a lesser issue IMO, since the latency hit is usually pretty minor. I’ll take slow working RAM over non-functional any day lol