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m.2 SSDs and CPU lanes vs Chipset Lanes

Memory and Storage - AnandTech Forums - forums.anandtech.com
I've seen many reviews of motherboards briefly point out, when motherboards have one or more m.2 slots, which slots utilize PCIe lanes from the CPU and which slots use lanes from the Chipset. I agree that having lanes that directly interface with the CPU as opposed to through the Chipset sounds better, as placing a storage device, essentially, behind a bottleneck like the DMI 4x connection between the CPU and Chipset (at least on Intel based boards) would at best still yield a higher latency connection.

What I haven't seen is a break down of how much performance suffers when a high performance (or a low performance, I suppose too) m.2 NVMe SSD is placed on a Chipset fed slot vs a CPU fed slot. Is this really something to be worried about or is it negligible?

 


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