Arduino serial connection speed

Did you know that the arduino can use arbitary serial speeds? I have connected my UNO to my pc and uploaded the following sketch:

void setup() {
// put your setup code here, to run once:

void loop() {

This works fine when I connect my pc to the arduino via putty and set the speed to 500,000

I wonder what the maximum speed is.
My tests showed that it is 4,000,000. This is 4 megabit/s. About 16 times the memory of an arduino UNO. I am not sure how this could be useful, but it is good to know.

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