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oakwhiz | 6 months ago

Were the lanes engineered for 5.0? Maybe this is a signal integrity issue.

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SilverBirch|6 months ago

The way product segmentation works in this market it’s practically certain they’re physically identical to the board that supports 5 and the only difference is firmware locks and marketing.

Aurornis|6 months ago

Having some PCB experience, I disagree. Targeting higher specs like PCIe 5.0 usually requires more expensive PCB materials and tighter qualifications at the test stage.

If the boards were only being tested to PCIe 4.0 (their official spec) then you can't guarantee they perform the same as SKUs targeting PCIe 5.0.

You can't notice these differences with your eyes.

dale_glass|6 months ago

PCIe 5 is 32 GT/s (~4GB/s) per lane, and of course double of that of PCIe 4.

It's a crazy rate that can't be trivial to achieve.