Reputable x4 to x16 PCIe riser cables?

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Hello,

I’ve got a machine with closed-end PCIe 3.0x4 and 4.0x4 slots. I want to use them with x8 cards that I know will work fine at x4 speeds.

So, my (vague) plan is to get a pair of short x4 to x16 straight-line riser cables, and fit the cards with half-height brackets so there’s room to just screw them in the case’s PCIe brackets and run the riser down to the slots on the board to connect them.

But I have no idea how to shop for good quality riser cables. I’ve never bought them before, and am wary of the dozens of no-name OEM brands.

Any suggestions would be appreciated. Thanks!

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I got a m.2 to PCIe x16 from this company:

You can find them on aliexpress, quality is some what decent.