4 ms·
It's now 25% for DDR5.
by wmf 3y ago
It's now 25% for DDR5.
- Animats 3y agoThat's not bad. A few years ago, it was more like 100%, and hard to get.
- wmf 3y agoNo, I mean a DDR5 ECC DIMM has 25% more chips (10 vs. 8). I don't know what the price difference is.
- adrian_b 3y agoThat 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.
- P_I_Staker 3y agoI don't know what it is either