My thoughts exactly...
Corsair does something extremely problematic, especially considering how distribution chains work. They release multiple different memory sticks under the exact same SKU name, and change the "version" of the SKU to distinguish between what type of memory IC that particular unit carries. Mixing and matching these, even if they are externally and otherwise physically identical, has serious implications to the performance and stability, because different ICs respond differently to timings, voltages, etc. - to the point that both kits will probably never work together well.
I have a quick-list saved here that someone posted on a Discord server I used to participate in to decode these, I can't speak for its accuracy, though - some revisions tend to be rare and data on them is muddy. It could be useful, so I am sharing:
Code:
Corsair DDR4 revision list:
Micron
3.20 Micron 4Gbit Rev. A
3.21 Micron 4Gbit Rev. B
3.22 Micron 4Gbit Rev. E
3.22 Micron 4Gbit Rev. F
3.31 Micron assortment (Rev. B E, H J or D)
3.32 Micron 8Gbit Rev. H
3.33 Micron 8Gbit Rev. D
3.34 Micron 8Gbit Rev. E
3.40 Micron 16Gbit Rev. B
3.43 Micron 16Gbit Rev. E
3.44 Micron 16Gbit Rev. B
Samsung
4.14 Samsung 4Gbit D-die
4.23 Samsung 4Gbit D-die
4.24 Samsung 4Gbit E-die
4.31 Samsung 8Gbit B-die
4.32 Samsung 8Gbit C-die
4.33 Samsung 8Gbit D-die
4.34 Samsung 8Gbit E-die
4.40 Samsung 16Gbit A-die
4.40 Samsung 16Gbit A-die
4.41 Samsung 16Gbit B-die
4.49 Samsung 16Gbit M-die
Hynix
5.20 Hynix 4Gbit AFR
5.21 Hynix 4Gbit BJR
5.22 Hynix 4Gbit CJR
5.29 Hynix 4Gbit MFR
5.30 Hynix 8Gbit AFR
5.31 Hynix 8Gbit BFR
5.32 Hynix 8Gbit CJR
5.33 Hynix 8Gbit DJR
5.34 Hynix 8Gbit EJR
5.38 Hynix 8Gbit JJR
5.39 Hynix 8Gbit MFR
5.49 Hynix 16Gbit MJR
You should be able to see which version your particular memory sticks are by looking at the label imprinted on each of the them, here's an example from an old kit I have around:
