I decremented one which I could go lower to 2100 and will be monitoring the invalid shares how they will behave,unfortunately I can only go lower to one card,need to restart PC to change settings of the other card which I am not going to do,I am happy with the stability of the miner,since I have suffered a lot from instability of all other miners the only thing I truly care is to find finally one miner that is stable and does not crash.
On both Linux and Windows you can adjust the mem clocks without rebooting, so I'm not sure what you're talking about.
In either case, if you're going to waste your own power with a suboptimal setup, nobody's going to stop you.