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The pcengines APU2 will do gigabit happily on four interfaces with passive cooling and ECC memory, there’s nothing but actual servers which will do more realistically speaking.

+1 for APU2. I've written about my experience with it (+ NixOS) here: https://skogsbrus.xyz/blog/2022/06/12/router

As the other commenter said though - max speed is 1gbps. And approx 200mbit/s over wifi with 5ghz and the same network card I used.

You can get a Supermicro X10SLH-LN6TF, 6 10GBbit ports, for less then $100 on ebay.