Quote from: visdude on January 15, 2015, 06:05:23 AM

Quote from: ryanjf on January 14, 2015, 03:13:54 PM

Quote from: visdude on January 14, 2015, 04:18:00 AM

Quote from: ryanjf on January 14, 2015, 12:17:45 AM

So I think I found a solution to the high pitch whine of the stock fans. We all know the guide vanes are what's causing the pitch. I received a fan with a broken blade on my my batch 1 S5's and Bitmain was kind enough to ship me a new one. I decided to do a little experiment today to see if reducing the number of vanes would change the pitch, which for my ears (healthy 35 year old) now sounds more like a S3.

You notice on the vane there is a thicker part on the outer edge, I took some wire cutters and cut every other vane right where the thin part of the vane meets the thicker part (careful to line up the fan blades so you don't accidentally cut one). I then used my thumb and as close to center as possible I just pushed down on the cut vane and it popped right off. Note that the power wires run down one vane so you probably will want to start there and you'll still end up with an odd number of cuts. Here's a picture and for those brave enough to try it, let us know your results. My temps are exactly the same and I do use a high cfm pull fans as well. Still experimenting with those, so far the Silverstone Tek 140mm x 38mm Fan seems to be giving me the lowest temps but these S5's seem to run in all different temperature ranges so it's all subjective.

https://farm8.staticflickr.com/7515/16089177837_65df09d9d5.jpg

That has been my thought/plan if and when (a big if and when) I get S5s except I would be leaving only 3 or 4 vanes and Dremel the rest of them out "clean". If that will not be satisfactory, there's always the Delta fan option. I'm glad to know that it did make a difference.

My only suggestion would be to remove and test. The vanes do make a big difference in channeling the air down the center and across the heat sinks. I have higher CFM and higher pressure fans that should in theory cool the S5 down better but without those vanes to center the air they aren't as efficient and my temps get dangerously high. Unfortunately we're stuck with the stock fans or Delta's, for us home miners that don't have climate control.

But you already said, "My temps are exactly the same" (after cutting off some of the vanes). You now seem to say that (cutting off the vanes) affects the temp. Did it affect your temp or not? Which one is it? Huh

The number of vanes I removed did not change the centering of the air flow affect the vanes create and my temps did not change. Cutting them out to only leave 4 I think would change that centering effect a possibly temps, I'm just saying if you're going to remove more than every other one, you might want to do it carefully and test between each cut.