Dual Ball Bearings High Speed Durable 4 Pin DC 12V 5A 7000 RPM Cooling Fan Brushless Replacement Case Fan for Antminer Bitmain S7 S9 D3 L3 E9 T9 etc All BTC Miner Server (5A 7000RPM)

I have ordered these several times. In fact I believe I've ordered about north of 20 of these units. They are excellent replacements for fans that have failed for the L3++ and T17e miners. Easy installation and seem to be very reliable. No failures yet. Very satisfied.

running 2 of these on an Antminer S9. I've used the tuner to turn the idle speed down to 2400rpm and the noise is very livable. These are advertised as 7000rpm fans and when my miner reboots it pegs the fans to wide open throttle. I'm seeing 6900rpm as indicated by the software and this repeats every time I reboot. With software lag, I think it's reasonable to call this 7000. Anything over 4000rpm causes an ungodly howl. Some of that is my set up but some of that is the fans themselves. Noise is reasonable at/under 3500rpm and at 2400rpm I can sit next to the room the miner is in with the door open and no issue. Noise is important because I'm in an apartment. If it gets too loud, I can't run the miner.

tops off at about 66% of the duty cycle... just stops getting faster... so.."High efficiency:above 90%(can save more power in the same air volume)"was what the description said... lol... i guess that accurate... except you're saving energy because it just isn't actually doing anything. you're system is telling it to go faster, but it doesn't. odd. everything seems off about these specs... 24.60 mmH2O "wind pressure"??? yarite... five whole amps? uh... probably more like .5think the CFM figure seems about right it's just not spinning anywhere near that fast. i got it plugged into an arduino and a 15a supply... it's getting the right everything... it's just seriously gimped... i got two more and i want to test them to see if it's just this one, but i'm tempted to just send them back without opening the boxes...maybe they specked it in a vacuum.just reported 22k RPM uhh... must be the vacuum it pulls. if you have it sandwiched against a radiator with a filter on the intake, it'll spin that fast because it's in a vacuum... but.. i don't know if it's actually making much of a difference there between one amp and five..it's not drawing in any more air, so it just spinnnnnnnnns... you don't want that. you want it to be slowing down from the air it's pushing.

Exactly as described, thanks!

I had a PC fan go bad on me, the thing literally broke. So I purchased this replacement, installed it, and it’s been running smoothly ever since. I am as happy as can reasonably be expected.2 months later- it just stopped working one day. Do not recommend.

Thank god for bitcoin. These fans went onto my antminer s9 so easily. Spin up perfect and are a little quieter than my last fans

Bought this about 9 months ago and it wasn't used as a full time server fan. It died. It was occasionally used to vent warm areas around a laptop. Only used at 30-50% power. I really like the design and build quality but had I known it only had 3 month warranty even from manufacturer I would have gone a different route.

If you're looking to replace fans on your miners this will do the trick. I've nicked myself in fans before but never one of these, be very careful I feel like it'll cut your finger clean off if you aren't cautious