Nice… 7K, these bad boys can push.
I wonder how the noise will be?
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At 7k, they will be insanely loud. I don’t plan on running them more than 1200 rpm, which the noctuas top out on. I’ll have to write some custom fan profiles for the Synology, which should be fairly easy.
My hope is that within 500-1200 RPM, they will produce the same amount of noise as the Noctuas while moving significantly more air.
looks like arctic makes a 10k version. might as well go big.
There is mixed feedback on the intewebs on their noise at high RPM and performance on low rpm. Which I guess is not surprising – can’t cheat physics.
I gave up on trying to find quiet(er) fan for my supermicro “superstorage” chassis, and deployed 0 cost solution instead. Couple of holes in the wall to deploy the code compliant ethernet + power socket outside and moved sever to the patio. I don’t hear it, neighbors don’t’ hear it either (or are super nice people), everyone is happy. Highly recommend1.
1 I live in California, so the environment temperatures are always within spec.
Errrr…. It does occasionally rain in California, doesn’t it? 
Rarely 
But the patio is covered.
Don’t you have rodents? 
Only squirrels (also deers, bobcats, mountain lions, and coyotes) but none of them seem to be IT inclined at all, they have plenty of pinecones to chomp on. Hasn’t been a problem so far at least
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Got the fans home, and have begun doing tests. Looks very promising so far. They are inaudible at 500 RPM, great sounding at 900 and I start to find them annoying at 1400. Maybe I’m very sensitive to sound, or maybe I just don’t like listening to fans, but when I say they sound great at 900 RPM, I mean that they are just smidgen above audible. That is very impressive to me.
Fanspeed is a bit more tricky on Synology, since you work in a 0…255 decimal which corresponds roughly to 0.100% duty cycle of the PWM signal, which then again have a curve on the fans. I don’t have RPM readings in the box - I’m working on a video so you can hear the sound.
Fans come in a convenient 4 pack:
They are 38mm deep compared to the stock fans 32mm and the noctuas 25:
And for whatever reason, the fan caddies in the Synology box is 38mm deep with 6mm spacers. I took out the spacers, and the fans fit perfectly
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It’s great that you have software fan control to play with! Most swaps I’ve done don’t… and the OEM fans rarely have info about speeds. However… they all have had stickers on them that show amp draw at 12v. So the best I can do is estimate a little… and order a lower-amp replacement… and hope for the best!
All Synology boxes can have custom fanspeeds, if editing the /usr/syno/etc.defaults/scemd.xml file. That’s at least what I did
Would it survive the reboot and update?
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Awesome! That sounds very interesting! May i missed it but on what Synology model are you upgrading?
Also this question is a good one because i struggled years ago with my DS1511+ after upgrade to Noctua fans.
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@Alexey, I have not tried updates yet (I’m at the highest provided software level currently), but I can confirm it survives reboots without issue.
@Solu, It’s a 2u Synology rs3617xs (non plus). I have a couple of rx1217 boxes, that are a chassis design generation newer. They use the same fans albeit only three of them
EDIT: @Solu, as this thread was moved out of the general pictures thread, you might not have seen the video I made about the first state of the upgrade. I’m working on a part two with the fans from above:
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Good job, i can`t wait to see the update video 
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My friend,
An accident happened. I have had all the footage imported and edited as of this friday. The only thing missing is the voiceover which I was planning to do saturday, but saturday I was picked up by some homies and had an unplanned visit to drink-too-much-alcohol town and took a quick stop in lets-stay-in-bed-with-the-lights-off the entirety of sunday.
I had some real chores (like a now day old cleanup) to do today, so it’s first tomorrow I’ll finish the video. Let’s make a deal, if it’s not uploaded tomorrow at 22:00 uct+2 , I’ll send you 200 STORJ.
Cheers!
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Aaaaaah shucks, here we go. No StorJ for you this time homie, but I hope you like the video I made
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Great update, thank you for that.
Btw… i love the appropriate Half Life sounds you brought along 
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Cheers friend, thank you for the kind words.
I was so happy when I found this github repo - I had to use it! GitHub - sourcesounds/hl1: Half-Life Sound Files
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Because 2 minutes or less after system start you have heatsink at 100 degrees Celsius, broken CPU without warranty or shutdown at best.
Your disk don’t have TDP of 100W or more.
But try it and tell us what happened.