Bifurcation adapter

Finally got around to soldering a power lead onto my bifurcation adapter. This Supermicro unit was designed for PCIe 2.0, however, the electrical specs for PCIe 3.0 are the same, and the clock buffer chip supports up to PCIe 4/5 clock rate… hopefully it’ll link up at full pcie 3.0 speed.

Next step is to triple check the power connection before plugging it into the motherboard. Shame I had to butcher a $15 GPU y-cable to get that female connector, it was either than or spend $10 shipping on a $1 connector from Digi-Key. The board mount connector would have been prettier.

My plan is to connect it to the secondary x16 slot on my x399 board, and set that slot to 8/8 in the bios. I actually have enough slots for everything as it is, I’m more curious to see if this works, rather than have a absolute need for it. I’m going to double side tape a piece of foam onto the back of the card, it will fit perfect in my vertical GPU bay, which has three open slots.

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Does bifurcation have any performance impact on devices connected to the pcie slot.

Only in the sense that you take, say an x16 and split it into x4x4x4x4 hence every device connected there now only has 4 PCIe lanes.
In OPs example he seems to split a x16 into two x8 lanes so the devices can only get x8 lanes each.

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I don’t expect any performance impact. I’ll be moving a GPU that’s currently using an x1 riser and a SAS HBA that’s currently in an x4 2.0 slot.

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