Comment by aappleby

Minor note for those wanting to try this at home - these cheap dummy plugs only have a 256 byte eeprom, which is not enough for storing the various extended EDID blocks needed to specify high-refresh high-resolution configs. If you just want 1080p60 they're fine, but you won't be able to simulate a 4k240 monitor with them.

Also, some of them have the write-protect line pulled high (or low? don't remember) and you'll need a bit of surgery to actually write to them.