DDR5 RAM with ECC?
Are there clear identifying features for DDR5 RAM with true ECC?
All DDR5 RAM modules that comply with the specifications now have on-die ECC, meaning error correction on the chip. However, the data transfer between RAM and CPU is not protected by ECC.
Apparently (?) there are also DDR5 RAM modules with real ECC and this is (also allegedly) supported by some motherboards and AMD Ryzen 9.
But unlike previous RAM modules (significantly older design), all current RAM5 modules seem to be 288 pin.
Does this mean that the additional lines for the ECC signals are always included in this interface, or how should this be understood?
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Yes, the identifier PC5-xxxxE
“normal” DDR5 has the identifier PC5-xxxxxU
Is this marking only applicable to a particular RAM manufacturer?
For all, this is the official label according to JEDEC Spec
U for Unbuffered (The “normal” desktop RAM)
E for ECC
R for Registered
L for Loadd