DDR5, when it was announced, had a new feature called 'On-Die ECC'. Too many of the press, and even the DRAM company marketing materials misunderstood this important technology. It is not traditional ECC, and in fact won't do much if you really need an ECC system. Here's what it really does.

0:00 On-Die ECC
0:17 What is ECC
0:38 Memory Does the Refresh
1:38 Cosmic Bit Flips
2:26 Thermal Bit Flips
2:44 Bit Flip Danger
3:33 On-Die ECC is Different
4:28 Cell Validation
4:56 End-to-End ECC
6:11 CONFUSION
7:12 Takeaway
7:44 Why not have ECC Everywhere?
9:09 Special aside
9:32 Duck Tax

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Why DDR5 does NOT have ECC (by default)