Dedicated carrier board for Raspberry Pi CM4 module (and compatible models) for testing high-performance GPU cards, enclosed in the standard PCIe form factor card.

Technical specification:

ports: HDMI, 1GbE RJ45, 2x USB 2.0 host (Type A);
power supply inputs: 12VDC DC barrel jack or 6-pin Molex (8A max.);
microSD slot for CM4 Lite module;
full 40-pin GPIO pin header;
4-pin fan socket (controlled by EMC2301) - 5/12V version supported;
USB-C for flashing CM4 module;
system and user LEDs;
PCIe x4 edge connector (PCIe x1 lane only implemented);
I2C diagnostics module for analog measurements (system power rails, 3.3V/5V/12V, voltage/current);

Project published as Open Source Hardware (OSHW) under CERN OHL v1.2 (Open Hardware License).

https://github.com/mfolejewski/PiG_Pi4GPU
https://github.com/geerlingguy/pi4gpu

Jeff Geerling video review:
https://www.youtube.com/watch?v=l9dItRUjQ0k