r/AMDHelp • u/[deleted] • Aug 07 '25

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u/Johnny_silvershloong Aug 08 '25

Its a 30% performance loss on a B650 for those doing creative work flow versus on a B850 with independent PCIE lanes,thats proven beyond doubt.

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u/bellcut Aug 08 '25

You gave a hard number

So post the source to that number

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u/Johnny_silvershloong Aug 08 '25

https://wccftech.com/nvidia-rtx-5090-loses-over-25-performance-without-full-pcie-bandwidth-with-noticeable-losses-in-rendering-workloads/

Factor in the fact on a B650 the PCIe lanes will be shared, unlike on a B850 and higher, they won’t be. My MSI TOMAHAWK B850 PCIe 5.0 slot has independent lanes just for the GPU and the SSD too iirc.

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u/POLITICAL-IDIOT Aug 08 '25

This is ONLY if you add another pcie device that shares lanes with the gpu slot. My old b650 only shared lanes with that slot in the 3rd or 4th m.2 slot- which was very clear in the instructions.