Well i dont know that fan but the Delta as stated above isnt so much loud as it is annoying with its high pitched squeeling. I had to make it run @7V because i was actually getting head aches after a few hours on the comp.
The delta is louder than the YS tech, but it really depends on your personal noise tolerance. I run 67cfm and a 38cfm delta's piggybacked on my thermoengine and the noise does'nt bother me. But then again I'm an Ex-navy guy and silence scares me ;D