S4028-15K - 40x40x28 mm Fan, 1400-15000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black

I bought 2 of these fans to use in my remote control vehicles. I had to convert it to a 3 wire plug, (YouTube has a video using these fans) but they really pump the air and keeps my motors a lot cooler when bashing on my trucks.

These fans are a bit louder than I would have hoped for, but they're still quieter than what they replaced. I did some math before buying and determined that the 6K variant would not be enough for my use case on a Tesla P40. That was correct, as these fans have to be at 11-12K RPM to keep temperatures under control. Under a more moderate load, they can run at 9K or less to keep it cool. Overall, if you're trying to cool a 250W TDP or so GPU like a Tesla P40, these work fairly well for the price.

Hooked from a 12V 1A power supply w/ barrel connector to terminal connector to the fan, following the diagram shown in the picture. The diagram is backwards. Reversed to other side of pins, ground on outside, positive on inside, and it worked. Ran through a PWM controller then to fan connector, and spins right up. It'll move quite a bit of air for it's tiny little size. Put this on top of a SBC in an aluminum case, on slowest the PWM controller will let it, and it's *fairly* quiet. Turn this little thing to max, and it gets fairly loud. Moves quite a bit more air than a 120mm high flow case fan. -1 star for the incorrect pinout, picture is accurate. No mounting hardware, will have to purchase/reuse depending on application. Unsure quality, that'll be a longevity thing. As far as value - I bought it because it was cheap, I knew it didn't have hardware, but for my application, needed some modifications anyway, so no big deal for me, YMMV.

Fast, lots of static pressure, loud. If you've ever been in a server room it's going to sound like that - this isn't a fan you will want to listen to all day (the 15,000 RPM one). Being quiet isn't its purpose I'm just warning people who may not know.

Very powerful fan moves a lot a air well just a little loud other than that if you need to move airflow (cooling well) probably one of the best out there!