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X670E Extreme M.2 Capacity

Level 7
I'm just trying to figure out what the highest possible amount of NVMe drives that the X670E Extreme can support. I suspect it is 5 (by default), as follows:

1. M.2_1
2. M.2_2 (which drops PCIEX16_1 down to x8 and PCIEX16_1 to x4)
3. GEN-Z.2_1
4. GEN-Z.2_2
5. PCIe 5.0 M.2 slot (via ROG Hypercard)

The question I had was if I were to buy the ASUS X16 Hyper M.2 Card, which can accommodate 4 NVMe drives, and put it into PCIEX16_2, would I be able to recognize at least 2 of the 4 drives? I assume not, as that slot is only running X4. Could you run 2 drives at X2 each?

Am I correct in thinking that the only option would be to plug the included X4 Hypercard into the bottom X4 slot and get another card for PCIEX16_2 and add one more M.2 that way?