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A: The C519 heatsink fits the [https://www.raspberrypi.com/products/compute-module-5-io-board/ official Raspberry Pi CM5 IO board ] without issues. However, compatibility with third-party IO boards may vary. For example, on the Waveshare CM5 POE IO Board, the heatsink may interfere with the POE circuit's square inductor. In such cases, slight modification (e.g., trimming a small notch with a Dremel) might be needed to achieve proper fitment. Please check the layout of your IO board and C519 size before installation.
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