this post was submitted on 18 Aug 2024
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PC Master Race

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PCIe bifurcation (lemy.lol)
submitted 2 months ago* (last edited 2 months ago) by SitD@lemy.lol to c/pcmasterrace@lemmy.world
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Hey y'all, I bought a x4x4x4x4 4 slots M.2 PCIe card foolishly thinking that if it fits in the slot, it would surely work. In the end, I got 2 of the 4 SSDs working on my old AM4 X470 chipset. I'm coming to you for advice what the cheapest way to get to use this would be. I've noticed that a lot of CPUs have a PCIe lane limitation of 28, just short of what I need (I'd like to run the SSDs but also a x16 GPU). I'm not too keen to buy a threadripper setup for this occasion...

Cheers!

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[–] fuckwit_mcbumcrumble@lemmy.dbzer0.com 2 points 2 months ago

What mobo do you have? That's the most important thing here. Your mobo will almost always be the limiting factor in bifrucation.

When I was looking around before I saw that Asus supports 4 way bifrucation. I got bored so I asked chatGPT and it thinks only two x470 mobos support 4 way bifrucation. ASUS ROG Crosshair VII Hero (Wi-Fi) and MSI X470 Gaming M7 AC. It also seems to think x570 has better support, but I think that's more just that they support two way vs no bifrucation at all.

4 way bifrucation isn't a very common thing for a regular user to do which is probably why so few boards support it. 4 way plus a full fat GPU is even less common. To be honest I'm kinda surprised any 400 series boards support bifrucation at all.