If you are sure it will fit, then I'd suspect it'd be the best you could fit. I know Biffa managed to get one in there, but I may be down to the motherboard layout as much as anything else. Very nice cooler, I have a 7000 and it's silent when the fan's on auto. When playing games and it's spinning faster it's a little noisy, but nothing too excessive. I'd imagine the 7700 is pretty much inaudible all the time, especially if you're still using the stock PSU and Exhaust fan.