Sound deadening can help muffle minor sounds but so long as you're running quality fans and using a fan controller of some sort there's no reason a windowed case can't be quiet. Those who claim windowed cases to be loud probably have low quality fans or everything turned to max. I can't speak for the r5 specifically but I doubt it's that much different than any other windowed case. My enthoo pro is a pretty open air design, open vents all along the bottom, front and top with a large side window. Currently running 7 fans in total, a 200mm intake, 140mm exhaust, 2x 140mm as top exhaust, 2 fans on my cpu air cooler and the gpu fan on my hd 7850 (not the quietest card ever). Yes, if all fans are cranked to full speed it can get a little...