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Nvme storage question on Taichi x870e mobo

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Ronharr View Drop Down
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    Posted: 11 hours 54 minutes ago at 10:12am
I am building a pc using Taichi x870e motherboard and AMD 9950X3D, changing from an intel cpu and Asus ROG Maximus Hero. The Asus Mobo comes with a pcie expansion card that can hold a maximum of 2 Nvme devices. It is not independently powered drawing upon the pcie slot exclusively.
I?™m wondering if I can install this card in PCIe slot 2 ( with the gpu in slot 1) and be able to see both Nvme devices. I plan to populate the 4 Nvme motherboard slots as well.
I need somebody who has knowledge of what the mobo and its chipsets can accommodate. It?™s a little bit above my tech grade and I?™d prefer to know ahead of time rather than determine by trial and error.
Help appreciated
Ronharr
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eccential View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote eccential Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 49 minutes ago at 6:17pm
Look at the page 11 (as printed) / page 15 (pdf file) of the user manual.
The two PCIe slots can run either as x16 / disabled or x8 / x8.

Now, the question is, what does that PCIe -> m.2 x 2 card do?

Based on ASUS page: "** When ROG Hyper M.2 card is installed on PCIEX16(G5)_1, PCIEX16(G5)_2 will run x8 only and if ROG Hyper M.2 card is installed on PCIEX16(G5)_2, PCIEX16(G5)_1 will run x8 only," I'm guessing that the card itself has no logic and depends solely on motherboard's ability to bifurcate.

I'm assuming Taichi x870e can do x4/x4 bifurcation, at least on one of the PCIe slots. And if so, you should be able to use the m.2 splitter card on that slot, once BIOS setting for bifurcation is set properly.

Now, I'm not sure if you can do this independently for the two PCIe slots. For example, if you want to use the top PCIe slot for GPU, then you'd want x8 + x4/x4. If you want to use the bottom PCIe slot for GPU instead, then you'd want x4/x4 + x8. No idea what configurations the motherboard supports.

The other possibility is that the PCIe -> m.2 x 2 card has built-in PCIe bridge. If that's the case, it should just work, if with a slight bandwidth / latency handicap.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ronharr Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 38 minutes ago at 8:28pm
Thanks for your reply. The 2x2 card doesn?™t have any integrated circuitry that I saw when populating it. I assume that would be necessary to ?œbridge??the devices but this is a guess. I don?™t grasp the full drift of the bifurcation but you?™ve gone a long way to helping.
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