that all depends on your tolerance for noise. i heard all this stuff about how loud the delta was, but i have one in my rig and it really doesn't bother me at all.
only time i really notice it is when i'm playing a DVD on my machine and lying in my bed. i have a output case fan right above the cpu and it points directly toward where my bed is. so unblocked noise comes out. but hey, it isn't enough much noise that Pro Medias can't overcome 😀