Does the cooler plug into the graphics card for it's fan's power.. or directly into the motherboard? If it'll fit into either you could maybe try straight into the motherboard and then control it with speedfan or something similar (being as I HATE speedfan) and then you have better control.
If you really wanted to pimp your 275 I'd suggest getting a nice fan controller for like £10 and hooking that up to your GPU cooler. At idle just turn that ****** right down, and when the games come out just crank it all the way up
Just my two cents.