Do MacPRo mid 2010 models run with level fan noises or uneven whine?

Apple is replacing my mid-2010 mainly because of a disturbing modulating, up and down, fan noise problem. Not sure of the source. At first thought it was 5870 graphic card, but haven't been able to nail down exactly why.
They claim that these machines run with a very even level noise, and that this breathing or modulating noise is not the norm.
I have read that these machines, relative to earlier models, are quiet hummers, at least relatively.. Do most people with this year's model have machines running at a constant noise level or do the fan noises, even at idle, modulate and whine up and down, even with light usage...or on idle. I don't want a replaced machine with the same issue. I do work in a quiet environment, and don't mind the fan noise, but the modulations of up and down sound like a tunnel and I need to turn off the computer at times. Model is 3.2 ghz quad core, with ati 5870 graphic card.
thanks

I am very much interested in comparison here too. Unfortunately our local reseller doesn't have any Mac pros to compare (they deliver only when you make an order:(). So I have no other machines to compare...
So I've read a lot of forums and generally there's no simple answer anywhere. People say that their hdd/optical is making more noise than fans. That's true to my case. Hdd/optical indeed sound louder than fans. From the other hand, I work in very quiet environment (no street noise, no ventilation noises in the room or whatever) and my new Mac Pro sounds... well loud! Once again - relatively it is QUIET, I can hear older PC from the other room (and the 'other room' connects through a corridor so...). Still, a lot of people mention that they literally don't hear ANYTHING from their mac pros except for hdd/optical operation sounds. I do hear fan noise...
So i was wondering is my room too quiet/ear too sharp;) or is there some kind of a problem with the mac pro and I should bother contacting retailers?
Anybody here who can compare their mac pro's with say mac book pros? I clearly hear fans of my mac book pro (even being idle) in the main working room and mac pro is like 2-3 (may be 4) times louder than mac book pro. This might be OK for tower, but definitely it is not 'dead silent'...
So far I've even tried some iPhone decibel measurement apps (yeah it's not even close to 'pro' measurements but no other means are available to me at the moment). They doesn't notice mac book (most noise measurement devices as far as I've read don't count noises beneath 40 dB for good), but mac pro is about 42-43 dB while idle at some 10 inch from the machine and some 45-46 if I bring the mic like 3-4 inches to the case. Is it like OK or what? Unfortunately all Mac pros I've heard before where in environments where even my 42-46 dB would be completely lost, so i cannot judge if it is OK. It is still one of the quietest towers I've heard/owned but those posts about 'dead silent' and 'only hdd/optical' make me a bit uncomfortable...
Oh, and the modulation. Indeed idle operation has some modulation. As far as I can tell it comes not from varying speed of the fans but rather from how frequencies of the fans inside of the case are different and modulate when added to each other (like those FM/AM in the synthesizers). More to say, there are angles in a room where other frequencies are heard (probably reflections produce some additional modulations)...

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