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Old 09-26-2019, 07:49 PM   #28
Glennbo
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Here's another article making the very same claim about the lanes between chipset and CPU vs lanes between CPU and peripheral support.

"Since the B550 does not support PCIe Gen 4 it will be linked to the Ryzen 3000 CPU via four PCIe 3.0 lanes instead of four PCIe 4.0 lanes like X570, meaning bandwidth will be significantly lower. However, PCIe Gen 4 support should still be available to B550 users via the CPU, so B550 boards could feature a PCIe 4.0 X16 Slot and a PCIe 4.0 M.2 interface to connect high-speed PCIe 4.0 SSD drives."

https://www.kitguru.net/components/c...Speed=noscript

I'd have thought the chipset would be involved in communication to devices like SSDs, but maybe sans-SATA it can be done with the CPU alone.

Edit:

This article sounds more believable to me, and for me would work great because I want the PCIe 4.0 throughput for M.2 NVMe and don't care about it for a gaming video card.

"Although the B550 chipset is built for Ryzen 3000-series CPUs, it won't be fully PCIe 4.0 enabled. The chipset will support four lanes of PCIe 4.0 off the CPU for the primary M.2 NVMe slot, but both the 16-lane GPU connection and four-lane chipset GMI link will support only PCIe 3.0 (as was the case with X470/B450)."

https://www.vortez.net/news_story/am...rt_pcie_4.html
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Last edited by Glennbo; 09-26-2019 at 08:10 PM.
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