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.