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PCIe card splitting: X16 to X8+X8, X8 to X4+X4

Overview

The project description
is mainly modified from https://oshwhub.com/oldmonster/CEM4NGFF_GEN4_EVM.
Originally planned for ASUS P9D motherboards,
the X16 split (X8+X8) PCB has an overall height of approximately 46 mm, with standard spacing between the two PCIe slots and a 90-degree rotation. The X8

split (X4+X4) PCB has an overall height of approximately 46.8 mm, with standard spacing between the two PCIe slots and a 90-degree rotation.

Both have been prototyped at JLCPCB SMT. The X8 split (X4+X4) has been verified on a machine. The X16 split (X8+X8) cannot be verified due to lack of equipment. We welcome experienced developers to verify and provide feedback (it should be fine). --- 2024/08

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-27 00:32:05

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