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by Teknoman117 2640 days ago
Every single Ryzen/threadripper/epyc board I’ve played with has supported bifurcation.
2 comments
wtallis 2640 days ago
I've encountered a Threadripper motherboard that lacked the firmware capabilities necessary to use a passive PCIe x16 to quad M.2 board.

I also haven't seen those quad-M.2 boards listing support for the mainstream Ryzen (AM4) platform, only the Threadripper and Intel HEDT platforms. Have you gotten an AM4 Ryzen system to split its x16 slot into 4x4?

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Teknoman117 2630 days ago
Yes, but now that I look it up it's apparently a feature restricted to X370 and X470 boards. Doesn't really make sense to me considering the PCIe comes off the CPU.
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vetinari 2639 days ago
TR4 boards that were released at TR launch day might miss the firmware support for PCIe bifurbication in the initial release. However, it was added in the later firmware releases.
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detaro 2640 days ago
Good to know, in the past it has been kind of random where motherboard manufacturers enabled it.
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