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That is no longer true. The DDR5 standard allows either 40-bit channels or 36-bit channels in ECC DIMMs. (A DDR5 UDIMM has 2 channels, while the desktop CPUs u
by adrian_b 3y ago
That is no longer true.
The DDR5 standard allows either 40-bit channels or 36-bit channels in ECC DIMMs. (A DDR5 UDIMM has 2 channels, while the desktop CPUs use 4 channels provided by 2 sockets.)
The former choice corresponds with a 25% overhead, while the latter with a 12.5% overhead.
In the beginning there were only 80-bit ECC DDR5 UDIMMs, because the DRAM vendors preferred to make only x8 chips. More than a year ago, 72-bit ECC DDR5 UDIMMs have also apppeared, which use a mixture of x8 and x4 chips.
Nowadays no ECC memory vendor can justify a 25% overprice, because if they happen to use 25% more memory that is because they believe this reduces their production costs (by making a single kind of chip). Only an overprice slightly more than 12.5% is right.
Unfortunately, due to limited offer, the ECC DDR5 UDIMMs can still be up to 50% more expensive than non-ECC modules.