Question X570 4.0x2 m.2 slot question.

STERKOFF

Member
Jul 8, 2019
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When installing a 3.0x4 NVME drive in a 4.0x2 slot on an x570 board, the sequential drive read/write is capped just below the 2k mark since it is still only using 2 lanes at 3.0 regardless of the greater overall bandwidth available with the 4.0 m.2 slot.

How does this 4.0x2 m.2 slot work with a drive like the WD Black SN750 SE which is a gen 4 NVME with Gen 3 max speeds under 4k read/write? Would the WD Black SN750 SE still be able to reach near its rated speeds since even in a 4.0x2 slot its maximum performance would still be under the theoretical limit of the 4.0x2 lanes?
 

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