DDR5 UDIMM and RDIMM have different keys, as they’re not interchangeable.
lepobz
UDIMM is Unbuffered, RDIMM is Registered. The latter is for servers and workstations, typically Xeons and EPYCs that are designed for registered dimms.
OriginalCrawnick
Call me crazy but label aside if you turn one over don’t they both align the same?
TactlessDrawing
Y’all downvote anything that moves 💀
Lord_Pazzu
Whoa why are OP’s comments so heavily downvoted am I missing something
Josh9853
Bros being targeted by the JEDEC mob
not_a_cup
I just wanted to chime in and say fuck you OP
/s
I_burn_stuff
one’s a Rdimm, one’s a UDIMM. You won’t see RDIMM support outside of enterprise stuff. On DDR4, they used the same keying. On DDR5, they use a different supply voltage. UDIMMS get 5V I, RDIMMS 12V. The key is to keep you from sticking a 5V input part into a 12V slot. servers tend to be 12V heavy, a lot more so vs desktops so it’s just more of the same.
A UDIMM lets you have ECC on a desktop with an AMD chip like I do.
VtheMan93
So, apart from all the hate, pls allow me to explain that OP has one stick facing the opposite way.
Look at the notches. Look at that bit of unpopulated area besides the notch. See how one is opposite to the other? Take any stick and rotate flip it over by the long edge, and they will be keyed identically.
10 Comments
[deleted]
DDR5 UDIMM and RDIMM have different keys, as they’re not interchangeable.
UDIMM is Unbuffered, RDIMM is Registered. The latter is for servers and workstations, typically Xeons and EPYCs that are designed for registered dimms.
Call me crazy but label aside if you turn one over don’t they both align the same?
Y’all downvote anything that moves 💀
Whoa why are OP’s comments so heavily downvoted am I missing something
Bros being targeted by the JEDEC mob
I just wanted to chime in and say fuck you OP
/s
one’s a Rdimm, one’s a UDIMM. You won’t see RDIMM support outside of enterprise stuff. On DDR4, they used the same keying. On DDR5, they use a different supply voltage. UDIMMS get 5V I, RDIMMS 12V. The key is to keep you from sticking a 5V input part into a 12V slot. servers tend to be 12V heavy, a lot more so vs desktops so it’s just more of the same.
A UDIMM lets you have ECC on a desktop with an AMD chip like I do.
So, apart from all the hate, pls allow me to explain that OP has one stick facing the opposite way.
Look at the notches. Look at that bit of unpopulated area besides the notch. See how one is opposite to the other? Take any stick and rotate flip it over by the long edge, and they will be keyed identically.