So the different clock speeds wont matter?
If not, will the slower one speed up to match the other, or will it slow down the other, faster one?
Cards in SLI will match the card with the slowest specifications.
If they stay the same speed, would that mean that when running a game on a monitor that is running from the slower GPU, it would perform less efficient than if on one of the other monitors?
Since they will run at equal speeds, there's no less efficient or such.