Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Breathing some life into this thread again. First off, thanks so much to everyone for contributing to this and making it a great resource (especially cfs.matt and Cinema5D). I took the plunge and operated on my Pegasus R6 TB1.

It’s funny, I used to have six of these next to my workstation (2 R6’s, 1 R8, 3 G-Tech Studios) and was just used to the constant droning of fans. But five of them got moved back to my office, and when it was down to just one R6 in my home office it stuck out to me how obnoxious the pitch and volume of these fans are. So I stumbled onto this thread.

I’m probably far less adept at this type of thing than the other users here, but I was successful in swapping the fans for the GeLid (couldn’t find the -B blue one so I used green) and 40mm Noctua (it took me about 8 hours…). Mine is probably more jimmy-rigged than someone that knows what they’re doing. I bought a soldering gun for this, but found the process a bit intimidating and ultimately used the omni-join scotchlok connectors from the Noctua for both fan connections.

Here’s a few notes about my process in case they are of use to anyone going forward. I imagine this information is still relevant and at least somewhat translates to Pegasus2 and 3 models as well. For the pros here, feel free to point out if I was majorly flawed in anything (like using the scotchlok connectors instead of soldering).

- I ordered the noctua fan in both 12v and 5v since some users were reporting their fan was not spinning / getting enough voltage. The 12v did work fine for me, but it was handy having the extra as I used the extra scotchlok connectors and a silicon mount (since I broke one) from the extra fan kit.

- The correct order for the backplane fan proprietary plug is (left-to-right looking in from PSU side) red - black - yellow.

- It was a major struggle pulling the silicon mounts through the left of the PSU since there is so little space. I had to pull them through by grabbing them with a tweezers and pull them out far enough to grab with a pliers, and pull at a weird angle. I did break one but fortunately had extras from the 5v kit I didn’t use. I was successful via perseverance and sheer force of will. cfs.matt or Cinema5D, was there an easier way to do that? Side note: looking at the madness going on inside that PSU majorly spikes my anxiety!

- I tested everything while it was still disassembled (I put all the drives back in though, is that necessary?). The GeLid didn’t spin at first, I checked all the scotchlok adapters and after pressing in more on the connector for the ground cable it did spin up without issue.

- When putting it all back together, I routed the extra PSU fan cable and connectors outside the PSU, as it was really tight trying to fit it inside and I couldn’t close the box / was worried of damaging the connections.

- I used the silicon mounts for the GeLid and just snipped off some of the extra so the back panel could fit on (without drilling new holes). It’s not perfectly flat around the fan, but I didn’t have any issue lining up any screws and it isn’t at all noticeable unless you look for it.

All is still working 12 hours later. I know that noise sensitivity is subjective, for me it wasn’t as dramatic a difference as I’d hoped. But it is running 7dB quieter and the pitch is much more tolerable. Just don’t expect this to make it silent. If I didn’t mess anything up and the connections hold up, I would still say the effort was well worth it. I thought about making a video tutorial, but then realized I'd probably be giving bad advice and it might not be worth the 12 views I'd get haha. Pics attached!

P.S. Anyone have any recommendations for 4 to 6-bay TB RAID that is quiet / a pleasure to work with?
 

Attachments

  • 20180210_2027_C0012-1-Edit.jpg
    20180210_2027_C0012-1-Edit.jpg
    368.5 KB · Views: 810
  • 20180210_2312_DSC01691.jpg
    20180210_2312_DSC01691.jpg
    408.5 KB · Views: 578
  • 20180211_0028_IMG_0239.jpg
    20180211_0028_IMG_0239.jpg
    498.1 KB · Views: 555
  • 20180211_0105_DSC01705.jpg
    20180211_0105_DSC01705.jpg
    361.3 KB · Views: 519
  • 20180211_0249_DSC01710.jpg
    20180211_0249_DSC01710.jpg
    345.2 KB · Views: 514
  • 20180211_0159_DSC01707.jpg
    20180211_0159_DSC01707.jpg
    474.6 KB · Views: 561
  • 20180211_0250_DSC01711.jpg
    20180211_0250_DSC01711.jpg
    389.6 KB · Views: 566
  • 20180211_0252_DSC01717.jpg
    20180211_0252_DSC01717.jpg
    443.5 KB · Views: 515
  • 20180211_0320_DSC01723.jpg
    20180211_0320_DSC01723.jpg
    402.1 KB · Views: 580
  • 20180211_Results.jpg
    20180211_Results.jpg
    438.4 KB · Views: 538
Thanks LuxPro! I found this thread (also again) because the noise from my home office TB1 Pegasus R6 had been driving me nuts enough to generally have it turned off whenever possible.

I wanted to give another tip to try if you've had one of these sitting on the floor next to your desk for a while (ahem...).

Vacuum and compressed air! I took out the drives and vacuumed carefully all the dust off anywhere I could find it and used compressed air to stir it up.

It made a surprisingly big difference on mine.
 
  • Like
Reactions: satcomer
Hey LuxPro

I bought the two Noctua fans as listed in these posts. 2 wire was easy, but for the life of me I could not get the 92mm to spin up. I should have untangled the wires first before cutting them. Now even if I was to go back to the OEM fan, I'm not sure of the pin assignment. Promise was no help telling me I shouldn't be in there :-0

Do you (or anybody else) have the proper pin assignment for the connector on the mainboard, starting from the rear of the unit? I would assume GND, PWR and SENSOR. The Noctua fans wires were also different values which further confuses the situation

Thanks!

IMG_2974.JPG IMG_2985.JPG


Breathing some life into this thread again. First off, thanks so much to everyone for contributing to this and making it a great resource (especially cfs.matt and Cinema5D). I took the plunge and operated on my Pegasus R6 TB1.

It’s funny, I used to have six of these next to my workstation (2 R6’s, 1 R8, 3 G-Tech Studios) and was just used to the constant droning of fans. But five of them got moved back to my office, and when it was down to just one R6 in my home office it stuck out to me how obnoxious the pitch and volume of these fans are. So I stumbled onto this thread.

I’m probably far less adept at this type of thing than the other users here, but I was successful in swapping the fans for the GeLid (couldn’t find the -B blue one so I used green) and 40mm Noctua (it took me about 8 hours…). Mine is probably more jimmy-rigged than someone that knows what they’re doing. I bought a soldering gun for this, but found the process a bit intimidating and ultimately used the omni-join scotchlok connectors from the Noctua for both fan connections.

Here’s a few notes about my process in case they are of use to anyone going forward. I imagine this information is still relevant and at least somewhat translates to Pegasus2 and 3 models as well. For the pros here, feel free to point out if I was majorly flawed in anything (like using the scotchlok connectors instead of soldering).

- I ordered the noctua fan in both 12v and 5v since some users were reporting their fan was not spinning / getting enough voltage. The 12v did work fine for me, but it was handy having the extra as I used the extra scotchlok connectors and a silicon mount (since I broke one) from the extra fan kit.

- The correct order for the backplane fan proprietary plug is (left-to-right looking in from PSU side) red - black - yellow.

- It was a major struggle pulling the silicon mounts through the left of the PSU since there is so little space. I had to pull them through by grabbing them with a tweezers and pull them out far enough to grab with a pliers, and pull at a weird angle. I did break one but fortunately had extras from the 5v kit I didn’t use. I was successful via perseverance and sheer force of will. cfs.matt or Cinema5D, was there an easier way to do that? Side note: looking at the madness going on inside that PSU majorly spikes my anxiety!

- I tested everything while it was still disassembled (I put all the drives back in though, is that necessary?). The GeLid didn’t spin at first, I checked all the scotchlok adapters and after pressing in more on the connector for the ground cable it did spin up without issue.

- When putting it all back together, I routed the extra PSU fan cable and connectors outside the PSU, as it was really tight trying to fit it inside and I couldn’t close the box / was worried of damaging the connections.

- I used the silicon mounts for the GeLid and just snipped off some of the extra so the back panel could fit on (without drilling new holes). It’s not perfectly flat around the fan, but I didn’t have any issue lining up any screws and it isn’t at all noticeable unless you look for it.

All is still working 12 hours later. I know that noise sensitivity is subjective, for me it wasn’t as dramatic a difference as I’d hoped. But it is running 7dB quieter and the pitch is much more tolerable. Just don’t expect this to make it silent. If I didn’t mess anything up and the connections hold up, I would still say the effort was well worth it. I thought about making a video tutorial, but then realized I'd probably be giving bad advice and it might not be worth the 12 views I'd get haha. Pics attached!

P.S. Anyone have any recommendations for 4 to 6-bay TB RAID that is quiet / a pleasure to work with?
 
Hey bodob, sorry this is so late and may not be of help any more....but I did replace the power supply fan in my Pegasus2 R4 with this fan:

Noctua NF-A4x10 FLX 40mm

You can find more details on post #22 of this thread with a few pictures.

If you need any more info, please let me know.

----------

Also if anybody reads this and still cares. I am now running 1x 1 TB SSD Evo and 3x 3TB Seagate HDD in the Pegasus with the modded fan and power supply for the last 6 or so months without any issues at all.

Hey cfs.matt. Do you have the pin assignment for the fan connector on the motherboard? Thanks.
 
Want to make my Pegasus2 quieter but the modifications in this thread would significantly lower CFM.

Extensive research online revealed that the only way to make the unit quieter would be to lower the flow, i.e., there aren't any quieter equivalent CFM fans on the market.

Presumably the engineers put some thought into the airflow when designing the unit so not sure it's possible to reduce noise without compromising it unless someone knows differently?
 
Did any one confirm this for you as I am trying ti find out too?

Yes, Luxpro already confirmed this "The correct order for the backplane fan proprietary plug is (left-to-right looking in from PSU side) red - black - yellow."

My 92mm 5v Noctua fan works perfectly as the backplane fan.
 
Hi,

I have just signed up hoping to help here,
Hey LuxPro

I bought the two Noctua fans as listed in these posts. 2 wire was easy, but for the life of me I could not get the 92mm to spin up. I should have untangled the wires first before cutting them. Now even if I was to go back to the OEM fan, I'm not sure of the pin assignment. Promise was no help telling me I shouldn't be in there :-0

Do you (or anybody else) have the proper pin assignment for the connector on the mainboard, starting from the rear of the unit? I would assume GND, PWR and SENSOR. The Noctua fans wires were also different values which further confuses the situation

Thanks!

View attachment 822124 View attachment 822125


I found these online and ordered some,


These are the exact plug for the fan on the motherboard for the rear, I have ordered a Keep quiet fan for the rear and trying to find a decent replacement for the power supply. It does at least mean that i can put the original back in if i needed too.
 
  • Like
Reactions: srgz
Was just thinking about this modification and dropped back in to check on this thread. Thanks, lukerooney, for pointing out that I had posted the fan connector order in my original post.

Happy to report that, knock on wood, my Pegasus unit is still running great 2+ years later. I just recently brought back a second R6 unit from the office, for working from home, and am again shocked to see how loud and annoying these are stock. I think what I didn't realize when posting originally is that while a 7dB difference doesn't seem dramatic, loudness is perceived to double every 10dB. So it's closer to half the loudness of the stock fans. Which honestly seems consistent when comparing the two next to each other. It does run 2-3 degrees hotter, maybe that will catch up to me someday, but it seems like a worthwhile tradeoff so far.

I"m quite happy with the results all this time later. Might have to do this again for the additional R6...
 
Have one of these in my bedroom now.
Installed the Noctua NF-B9-1600 but it only spins for about 5 seconds at start up. Any idea what I can do to fix this?
I don't care about the fan error in Promise Utility.
 
This thread is great; I saw it first years ago but never got around to doing the same on my ancient TB1 Pegasus R6. It's rarely used the last years because it was so loud.

I also got the noctua fans. One mistake I made was first ordering the 40x10 fan for the PSU instead of the 40x20. The 40x10 is installed now and I figure with some electric tape I can cover up the air gap it created.

It's CRAZY QUIET so far. I have to stare at it and be really sure I can't see the fan blades to make sure it's running.

I didn't get the 92mm fan to spin up. The device turns on, thunderbolt light comes on, but fan or drives don't spin up. (Basically exactly the problem @Hirezgraphics had a year ago).

I'm 98% sure I got the JST-XH connector correctly soldered / wired to the new fan, but ... maybe I screwed it up. Does anyone have pictures of the OLD fan and how the wires are on that one (without the connector that I cut off without labeling the 3 cables ...).
 
I would like to take this opportunity to thank everyone who posted or uploaded pictures here.
my r4 is wonderfully quiet.

i also have the nucoda in the power supply. like most of you the 10mm. the 20mm didn't fit, you would have had to cut open the metal for that. the 20mm would certainly get through a lot more air.

like my predecessors, i had no luck with the 92mm nucoda. also 5 seconds then off. strange, but maybe a new series.

the gelid fan is hard to get in germany, but i found a reseller who sent it to me from austria. ancient, have been in the warehouse for a long time, one also purred, but the other is currently running perfectly.

i have a mac trashcan, so my editing system is very quiet and i had to get the raid quieter.

thanks again for the posts here! Great
 
I doubt I'll get any replies to this, but just in case any of the thread posters have this thread watched ...

I have a Promise Pegasus R6 (OG model) and recently my APC Back-UPS it was attached to died with an "Err02" error on the front panel LCD and it started making a nasty screeching noise. I was forced to push the power button in until it shut off.

I replaced the APC UPS with a new one and plugged everything back in. My 2012 Mac mini and my 5-bay SANS Digital RAID unit came up like a champ but the Pegasus refuses to turn back on :-(

Promise refuses to help me as it's out of warranty and EOL'ed. I'm pissed at the idea of having to buy a whole unit with disks (I don't need) just to replace a presumed fried PSU inside the R6.

I see pics of the PSU above but no identifiable info. Can anyone tell me what make & model PSU is in these things?

Edit: the original product manual mentions a
  • 250W Flex-ATA Power with 80 Plus Bronze
PSU. Looks like it's about a $50 item. But I need to know exactly if this is the right one ...
 
Last edited:
Bumping because I'd like to figure out the PSUs in these too.

I have an eGPU box I no longer use and if they just need a regular flex ATA power supply I might be able to just swap that in. I'm not sure if it's custom or not or just a regular compact power supply though. I might pull it apart to check and see if the swap works if all the cables seem similar.

My power supply makes a godawful high pitched noise that's driving me crazy, unrelated to the fans. Hoping a swap will help.
 
Bumping because I'd like to figure out the PSUs in these too.

I have an eGPU box I no longer use and if they just need a regular flex ATA power supply I might be able to just swap that in. I'm not sure if it's custom or not or just a regular compact power supply though. I might pull it apart to check and see if the swap works if all the cables seem similar.

My power supply makes a godawful high pitched noise that's driving me crazy, unrelated to the fans. Hoping a swap will help.
I just acquired a Pegasus R4 and also dislike the noise, especially from the Power Supply fan. It sounds like yours is broken, possibly oscillating. I would stop using the Pegasus immediately until the PSU runs quietly other than the fan noise.

An examination of the power supply shows that it is a Mini ITX form factor 250w PSU with a custom 12 pin auxiliary connector and a standard 24 pin ATX connector made by FSP. An internal examination reveals an unusual 40 x 15mm 12v fan. The additional depth is necessary because of the tight quarters inside of the PSU, the fan needs a higher static pressure than a usual 40x10 fan could provide. Further examination reveals some high-quality United Chemi-Con capacitors, but also a lot of cheap 2nd or 3rd tier caps.
Notably, the fan blows air in over the output section, which is where most of the cheap capacitors are. The airflow path is very confined, meaning things are extremely likely to get hot, which is why the original fan is so fast and therefore loud.

For fan modification, try using a 40x20mm higher pressure fan mounted on the outside blowing in, making sure to tape shut the side openings from the internally mounted fan. Noctura makes such a fan, though on my R4 I think the 12v one runs a little too slowly. Maybe I'll try a 5v one.

I suspect the noise from your unit is something oscillating probably due to one or more of the cheaper capacitors failing.
If this is so, it could damage the main board or your drives, or maybe some data. I recommend taking the unit out of service until it is fixed.

The PSU appears to have the standard ATX connector and a custom 12 pin auxiliary connector instead of the usual 4 or 8 pin auxiliary connector. The auxiliary connector appears to be wired for Ground, +12v and +5v, the same as the regular 4 or 8 pin, just with more wires.

The PSU might be repairable, if you can test and replace Low-ESR electrolytic capacitors which likely have high ESR.
It does look like someone is currently selling new Pegasus PSUs on eBay also.
Alternately, one could attach the custom auxiliary connector to a standard Mini-ITX PSU.

I will probably put in a higher quality Mini ITX / Flex ATX PSU at some point, maybe a Delta, and see how that works.

Lots of options! But for me, the Pegasus 1 is just a bit slow compared to a GRaid. So it's on the back burner.
 
Last edited:
Sorry for the delay, it took longer than expected for the Scythe fan to arrive. Anyway here are the results of all my fans on the latest version of the PromiseUtil software for Mac (3.18.0000.36):

Scythe Kaze Jyu Slim 100MM
- $9.99 CAD
- 600RPM (PromiseUtil reports fan as OK / Green > 500RPM)
- Very quiet, but does not move a lot of air, probably around what the Nocuta was moving
- Build quality of the fan was very good

EVERCOOL FAN-EC9225M12CA 92MM
- $5.49 CAD
- Would not spin up, voltage being supplied was too low by the enclosure.

GELID Solutions FN-FW09-20-B 92MM
- $16.99 CAD
- 900RPM (PromiseUtil reports fan as OK / Green > 500RPM)
- Pretty quiet (almost as quiet as the Scythe Kaze Jyu and Noctua)
- Build quality felt a little cheap compared to the rest due the gloss plastic used
- Temps: Controller / Backplane: 37C / 33C

XIGMATEK XSF-F9251 92MM
- $12.99 CAD
- 800RPM (PromiseUtil reports fan as OK / Green > 500PRM)
- Quieter than stock fan, but slightly louder than the rest of the fans I tried,
- Build quality of the fan was good.


Noctua NF-B9-1600 92MM
- $16.99 CAD
- N/A RPM (PromiseUtil reports fan as malfunctioning / Red < 500PRM)
- Very quiet, moves some air, probably around what the Scythem Kaze Jyu is moving.
- Build quality of the fan was excellent
- Temps: Controller / Backplane: 44C / 38C

Stock Fan:
- 1000RPM
- Very loud
- Temps: Controller / Backplane: 36C / 32C


Final Thoughts:

I ended up going with the GELID fan and for a few reasons:

- It felt like it moved almost as much air as the stock fan and was pretty similar in RPM

- Enclosure temps are more in line with what the stock fan provides

- Significantly quieter. I can hear a bit of a noise difference vs the Noctua, but its running a lot better temps. Its still as quiet as the nMP, so I think Im happy with this guy for now.

If you need any other info, please let me know good luck! :)


** I only included temps for the fans that I ran for at least a day, so that's why some are missing.

This worked well for a PegasusR4 and Pegasus2R4, but does not work with a Pegasus3R4 even though the enclosure form factors are all the same. The power supply fan works on all (Noctua), but the enclosure fan is now problematic. Had been using the recommended Gelid 92mm case fan. But it no longer keeps the enclosure cool enough and triggers all sorts of overtemp warnings. I tried 3 different Gelid fans thinking maybe they were defective but they all behaved the same. Compared to the stock fan, the Gelid runs too slowly for the supplied voltage. The Gelid runs at 600-800rpm when the stock fan runs at 1200. The Gelid runs at 1200 when the stock fan runs at 1900. The Gelid runs at 1600 rpm (max), whereas the stock fan runs at 2400 max. So does anyone know of a quieter chassis fan that moves more air than the Gelid?

I tried the new version of the Noctua NF-A9, and unfortunately it does the same as the B9 - reports fan as malfunctioning. Too bad, its a 38 cfm fan, higher than the 32 cfm rating of the gelid. Back to the stock fan
 
Last edited:
I tried the Arctic F9 fan and that would spin but too slowly to keep up with the temp. The unit overheated and shut down. I put the exact Gelid into my Pegasus2R4 and it worked fine. Bottom line - the Pegasus3 series generate a lot more heat so the only case fan that works is the original. The Gelid Wing9 works in the original Pegasus and Pegasus2 series but not in the Pegasus3 series. Hope this is useful to some people.
 
Hi, thanks everyone for sharing your experiences!

Today I successfully upgraded my Promise Pegasus2 R8 which has a 120mm fan instead of a 92mm fan.

For the PSU, I used the proven Noctua NF-A4x10 FLX model. And for the case Noctua NF-S12A FLX. Everything works perfectly, the Pegasus is whisper quiet. Everything is green in the Promise Utility and the 120mm fan runs at 600 RPM (maximum is 1200 RPM). Temps are 50°C for controller and 40°C for enclosure (i only using SSD in Raid6).

Utility.png


Thanks to the "3:2 Pin Adapter NA-AC2" which is part of the Noctua NF-A4x10, the work was quite simple and clean. I removed the pins of the black and red cable from the adapter, and supplemented it with a third yellow cable from another adapter. There are also 4x 3M Scotchloks in the NF-A4x10 package, where I used one to create the adapter for the 120mm fan and two to connect the 40mm fan.

IMG_1105.jpg

IMG_1089.jpg

IMG_1090.jpg


Here are original fans vs. new fans:

IMG_1098.jpg

IMG_1104.jpg



Some photos from the process:


IMG_1088.jpg

IMG_1091.jpg

IMG_1094.jpg

IMG_1095.jpg

IMG_1096.jpg

IMG_1093.jpg

IMG_1099.jpg

IMG_1100.jpg

IMG_1101.jpg

IMG_1102.jpg

IMG_1103.jpg
 
Yes, Luxpro already confirmed this "The correct order for the backplane fan proprietary plug is (left-to-right looking in from PSU side) red - black - yellow."

My 92mm 5v Noctua fan works perfectly as the backplane fan.
If you get the plug for the proprietary chassis fan from the source provided, note that it comes wiht colored wires opposite of the implementation on the board. e,g, looking from the power supply side, the connector left to right is red, black, yellow and the plug wires are yellow, black red, so you need to connect the wires on the plug to the fan in the opposite order of the colors.
 

Attachments

  • IMG_0019.jpeg
    IMG_0019.jpeg
    392.3 KB · Views: 70
  • Like
Reactions: srgz
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.