Question/Answered - DDR4 SO-DIMM pinouts, ECC verses non-ECC

[Arwen]

Okay, title had to be brief. So here is the meat of the question;

Are the DDR4 SO-DIMM sockets same between ECC and non-ECC?

Reading up on the DDR3 SO-DIMMs, it appears they changed the pinouts
for ECC enough that you have to buy what ever the board and CPU support.
I wanted to buy a low-end board with a CPU that supported ECC, (DDR3
SO-DIMM). But, it appears that the board maker has to design the boards
with ECC and then that forces all buyers of the board to use ECC memory.

So the real question is;

Are the memory standard designers idiots that don't learn from their mistakes?
And repeated the DDR3 SO-DIMM ECC verses non-ECC pinout problem?

Here is a reference to DDR3 SO-DIMMs with ECC, (ignore the URL reference
to DDR2, it's really for DDR3);

http://www.intel.com/content/dam/ww...ts/white-papers/ia-ddr2-ecc-so-dimm-paper.pdf

 

[Arwen]

For those that may be interested, it appears that the pinouts for DDR4 SO-DIMMs is
the same between non-ECC and ECC. Here are the relevant Check Bit pins, which
seems to indicate that they are no-connect in non-ECC SO-DIMMs;

Code:

Front:
87  CB5/NC
91  CB1/NC
101 CB2/NC
105 CB3/NC

Back:
88  CB4/NC
92  CB0/NC
100 CB6/NC
104 CB7/NC