Help with underclocking 670 FTW

So apparently GPU overclocks could be causing the issues I’m having with Metro LL and I want to try and revert the factory overclock I have on my card with a separate PrecisionX profile to see if it helps. I have no idea what I’m doing though. Looking the card up gives me a bunch of clock rates but I have no idea how to go about changing values in PrecisionX to underclock it. If someone could help me with this I would appreciate it a lot.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.