Are "maglev" bearings really that good?

[code65536]

I recently bought a Chenbro ES34169 case. It's a great case, except for the fans, which are a bit too loud. The fans are wired directly to the PSU and always run at full tilt. So I'm considering possibly replacing them with something slower/quieter.

The original fans: The model number is DFB701512L, and these are the specs that I found on the Internet:
* 70x70x15mm
* Bearing: ball
* Power: 1.9W
* Speed: 3000 RPM
*** Airflow: 22.2 CFM
*** Pressure: 2.2 mm/H2O
* Noise: 31 dBA

The potential replacement: I found the Sunon KDE1207PHV3, and these are the official specs:
* Bearing: maglev
* Power: 0.6W (32% of original)
* Speed: 2300 RPM (77% of original)
*** Airflow: 19 CFM (85% of original)
*** Pressure: 1.8 mm/H2O (81% of original)
* Noise: 21.5 dBA

So if these specs are to be believed, I can reduce power consumption by 2/3 and cut 10dbA of noise by sacrificing only around 20% of the cooling effectiveness? Frankly, it sounds a bit too good to be true. Are maglev bearings really that much better than ball bearings?!

 

[Wanescotting]

probably is too good to be true, buying computer fans seems to be more challenging than it should be....lots of misinformation out there. you might be better off getting a fan controller

 

[Schmide]

7-volt them (google)...profit...

 

[bmaverick]

Well, with over 60 million already made and being used in all types of environments, one can assume that the fans are living up to the claims. Sunon has been a company with a long right history.

 

[code65536]

Unfortunately, 7V isn't an option for me. First, because I am wary of re-soldering the wires for this, second, because if performance scale linearly with voltage, then I think that is probably too big of a drop in performance, and finally, because these are hooked directly to the PSU with nothing else on the line, this will result in me feeding 5V back to the PSU, and that's not kosher.

I'm just wondering if these numbers are realistic; i.e., whether the wattage is being understated or the cooling is being overstated.