Quote Originally Posted by Martinm210 View Post
Yeah, it's still a tough call even having both sitting here in my hands. The sound quality of the SFlex-E is very good and it gets way down in the RPM range if your after total silence.

Great links, at least I'm finding some consistency even though I measured on the fan edge mounted to a radiator and they measured open air inline with the motor axis.

I'd like to try some of the other RPM ranges just out of curiousity. I find it interesting how the different RPM ranges of the same fan lines produces very different results. My Sflex-E and Sflex-F preformed relatively the same regarding cfm/dB ratios, but the Sflex-G was different. I guess I always assumed it was the same fan with some very simple modifications, but after reading some of the fan development notes, it appears they design the motor specifically for different RPM ranges, etc...so they really are different fans despite looking the same.

Anyhow, I'm still trying to look through all this data myself and make sense of it, feel free to draw your own conclusions or if something seems out of place, I can always make another run to check.
Thanks!
Martin
I really appreciate the tests you are doing here. Up until now I could have sworn that the S-flex was the best fan, no doubt. But now your test beg to differ.

The thing I'm looking for is silence and good performance. I rather sacrifice performance for noise than vice versa. But looking at your graps it seams that the GT beats the S-flex series. It have a wider rpm range and have better noise/airflow ratio.

The s-flex E moves the same amount of air at 9V as the GT does at 6V. At 9V the E does 920rpm (56db) while the GT does 880rpm at 6V (53db). Looking at these numbers again I notice that there only is small numbers separating them both. And with the S-flex you get 50 000 hours more lifetime. It really is a tough choice. And the S-FDB (Fluid Dynamic Bearing by SONY Corporation) is really nice that the S-flex have.

How much difference does 3db actually make? And do you have any idea when you will be able to get your hands on some GT in the lower range?

"The sound quality of the SFlex-E is very good and it gets way down in the RPM range if your after total silence." But at 350rpm with a radiator there must be no air coming through at all?