Info I only recently noticed that DDR4 module pins are not equal lengths

[mikeymikec]

https://superuser.com/questions/1165330/why-do-some-ddr4-have-pins-of-unequal-length

Apparently it's to help reduce PCB stress on insertion/removal.

My first 5000-series build was tormented between installing a bigger HSF than I'm used to (Be Quiet Pure Rock 2), the above oddness (which I assumed must be intentional), and this:



It only showed up at an angle, and the modules are working fine (two runs of memtest86 7.4).

 

[bba_tcg]

I'd never noticed it before, but I just checked a DDR4 module and you are correct.

 

[Micrornd]

It came about because of/in combination with the memory slots with 1 fixed end and 1 "clip" end. It forces the module to be "rocked" into place.

 

[Dahak]

Its also the same on DDR5 stick as well just fyi, but the notch is in a different spot