I’ll update this post as I get all the individual charts cut, but here are the summary results and videos. This batch is released separately from my R6 results because for some reason my anemometer is reading differently and the batch failed my check in/out process to ensure consistency. As with any large group of tests, it can be a challenge trying to maintain the same exact conditions. In this example, I was not satisfied, so I broke the results out separately. I do however have one common fan, the yate loon, so you can do some cross references by comparing to that fan, then comparing to the other round 6.
A special thanks to Old Chap, RatDog (Cisco Systems), Utnorris, & IKIKUINTHENUTZ for sponsoring the fans
In general these were all fairly impressive fans considering most of this batch edged out the very good yate on noise level…at least at higher volts. I also had my first 10 for noise quality (At 500RPM the SlipstreamSL is hard to find fault, it’s practically inaudible)..not moving much air at that speed, but darn quiet too..
I also generally found more of the same, fans designed for high speed have noise quality issues at very low volts. The slipstream PWM vs SL for example, same goes for all the really high speed fans.
Utnorris’s San Ace also did really well at 12V slightly edging out the HE.
Regarding the Deltas….there seems to be a very clear difference between the newer REV 3 with notches in the fan hub vs. the older style. The SHE tested was of an older revision and did not test nearly as well as the HE tested here or the VHE tested in round 6. The older 25mm delta didn’t seem anything particularly above and beyond other than it has a fairly impressive RPM range. Unfortunately the slower speed Delta HE had trouble starting at lower volts. It really wouldn’t kick on until just under 9V, but since there are some controllers that can jump start at higher volts, I ran it back down to a lower than startup voltage just so you could see that possibility.
Slipstream PWM also seems to surprise a little on noise level, it performed really well there although I think it suffers from some motor tick.
I also had fun with my first “Made in the USA” DC-Muffin fan. Like the Papst, it too runs backwards. It was pretty tinny at low volts but had a respectable noise level at higher volts. I do think the 3 bladed design has more blade chop type noise though.
I also gave up on PWM vs Voltage control testing. So far, voltage control has been superior in noise quality, so I’m sticking to that for the videos.
Anyhow….those are my random thoughts…have a look at the videos and see if anything catches your eye.
In the end for me, I’m still eyeballing the sub 1000RPM range, and the yate and slipstream SL were smoothest down there. I think the slipstream SL vs GTAP13 or 12 would be a close match..
VIDEOS and INDIVIDUAL CHARTS/PIC
There you have it. I would highly recommend the side by side video method for comparing fans, just match up similar FPM levels via the blue anemometer and listen with your headphones at a reasonable level. Personally, I think noise quality is more important than noise level, but everyone has a slightly different take on it and their own preference.