5V DC Brushless Sleeve Bearing Cooling Fan

[roxcm]

Anyone tried these 99p fans??

I have a couple on order all the way from China so they'll take a couple of weeks to arrive. I'm planning to adapt a USB cable to get the 5v supply and run the fan on that.

Anyone got any experience of using this type of fan? Any good?

I tried using gooseneck USB fans - the kind that are meant for cooling the user - but they burned out after a day or two. Hoping these will last a few months at least.

Anyway, I'll post a review when I've had one running for a while.

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[armedmilitia]

What are you planning to cool with this fan?

[roxcm]

I have two USB hubs with 4 ASICs in each stacked one above the other. The fan will go under and blow air up through the ASICs. I've been using those gooseneck USB fans meant for keeping people cool as they use their laptop - they do the job, keeps the ASICs at ~40 degrees C, but the little motors in them keep burning out. Hoping these brushless jobbies will run and run.

[armedmilitia]

You know, if you just spread the ASICs out (I'm assuming you're talking about single-chip usb sticks, like red furies or U2s) you won't even need a fan.
Give them maybe 2cm of space from each other and they'll be fine. I ran ASICMINER block erupters like that for months, and got no problems.

Multi-chip miners I've heard definitely need fans though.

It'll save you a bit of cash! 

[roxcm]

Really? Even though they're overclocked?

When the fan goes pop I run them at 1.6Gh/s quite happily but my understanding was that when you overclock to 2Gh/s you really need to cool them?? They do get damn hot at 2Gh/s - hot enough to be too hot to hold between finger and thumb for more than a second or so...

They're Bitmain Antminer U1s.

Thanks for the advice!

[roxcm]

BTW, I was surprised to find that running a fan too close to the ASICs actually degrades their performance - I guess it's electromagnetic radiation from the motor interfering with the ASIC circuits.

I have to move the fan six inches away from the ASICs to reduce the interference to a level where it doesn't affect the performance of the ASICs.

[armedmilitia]

Oh boy, maybe if you overclock you would need to cool them. My experience using USB ASICs is just with block erupters, which weren't easily overclockable!

[roxcm]

Man, these little things are SWEET!

They are very nearly silent and the flow is good enough that on my two hubs stacked one above the other and without any sort of ducting to direct the flow, they quickly bring the temperature down from 65 to 40 degrees.

I just connected the leads to the power wires in a USB cable and it's good to go.

And at £1 each, I ordered two so I have a spare in case the first one doesn't last forever. But given that they are brushless and almost silent, I'd hope they'd last a while.

So I'd strongly recommend them!

[roxcm]

Oh, and you can locate these as close to the ASICs as you like and they don't emit enough interference to cause any problems - the (more expensive) gooseneck fans using basic motors with brushes had to be placed six inches away or they caused the ASICs to fail.