U in der JEDEC-Spezifikation

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Kommt bestimmt häufiger die Frage und ich meine die Antwort hier schon einmal gelesen zu haben. Was bedeutet das U in der JEDEC-Spezifikation PC4-32000U ?

Viele Grüße

 

[AdoK]

U = unregistered,
R = registered,
ECC = ECC = Error Correcting Code oder Error Checking and Correction

 

[Amaoto]

U = unbuffered.
Hier wird's erklärt: https://www.bladeloop.com/2019/07/11/unterschied-unbuffered-registerd-ram/

 

[h00bi]

DDR4:
A = Unbuffered 16-bit Small Outline DIMM (“16b-SO-DIMM”), x16 data bus (placeholder)
B = Unbuffered 32-bit Small Outline DIMM (“32b-SO-DIMM”), x32 data bus (placeholder)
C = Registered 72-bit Small Outline DIMM ("72b-SO-RDIMM”), x64 primary + 8 bit ECC module
data bus (placeholder)
E = Unbuffered DIMM ("UDIMM"), x64 primary + 8 bit ECC module data bus
L = Load Reduced DIMM (“LRDIMM”), x64 primary + 8 bit ECC module data bus
N = Mini registered DIMM (“Mini-RDIMM”), x64 primary + 8 bit ECC module data bus
R = Registered DIMM ("RDIMM"), x64 primary + 8 bit ECC module data bus
S = Small Outline DIMM ("SO-DIMM"), no ECC (x64 bit module data bus)
T = Unbuffered 72-bit Small Outline DIMM ("72b-SO-DIMM"), x64 primary + 8 bit ECC module
data bus
U = Unbuffered DIMM ("UDIMM"), no ECC (x64 bit module data bus)
W = Unbuffered Mini DIMM (“Mini-UDIMM”), x64 primary + 8 bit ECC module data bus

DDR3:
E = Unbuffered DIMM ("UDIMM"), with ECC (x72 bit module data bus)
F = Fully Buffered DIMM ("FBDIMM")
L = Load Reduction DIMM ("LRDIMM")
M = Micro-DIMM
N = Mini-RDIMM
R = Registered DIMM("RDIMM")
S = Small Outline DIMM ("SODIMM")
U = Unbuffered DIMM ("UDIMM"), no ECC (x64 bit module data bus)
W = Mini-UDIMM, with ECC (x72 bit module data bus)

DDR2:
E = Unbuffered DIMM ("UDIMM"), with ECC (x72 bit module data bus)
F = Fully Buffered DIMM ("FB-DIMM")
M = Micro-DIMM
N = Mini-Registered DIMM ("Mini-RDIMM"), no address/command parity function
P = Registered DIMM ("RDIMM"), with address/command parity function
R = RDIMM, no address/command parity function
S = Small Outline DIMM ("SO-DIMM")
U = Unbuffered DIMM ("UDIMM"), no ECC (x64 bit module data bus)


Hinweis: Das PC Rating wurde mit DDR4 geändert!
PC4-32000U gibt es also garnicht. Das heißt richtig PC4-4000U (DDR4-4000)

Weitere Beispiele für korrektes PC-Rating:
DDR4-2133 = PC4-2133
DDR3-2133 = PC3-17000 (Takt * 8)

DDR4-3200 = PC4-3200
DDR2-400 = PC2-3200 (Takt * 8)
DDR-400 = PC3200 (Takt * 8)