Ultimate Dual Fan for Pi3

spruce_m00se

@dd-indeed a bit, I tried that with one, and it drove me MAD!

spruce_m00se

@dd-indeed I actually bought a cheapo android based KODI box because the PI got so hot running KODI and the fan was annoying me too much, so 30 USD for a kodi box and it seems more responsive anyway and has an IR remote, so happy days, stuck it on a laptop cooling pad and its all gravy

DD-Indeed

Now I actually ran into pretty foolish trouble: I can't find a single benchmark test, that could be used via command line of the Retropie. Only ones I've found require OS to boot.

Edit: Nevermind, found one simple Linux test to be used with this.

DD-Indeed

Raspberry Pi 3 - Ultimate Dual Fan-cooler Tests

Overclock settings:

arm_freq=1300
gpu_freq=525
core_freq=250
sdram_freq=500
over_voltage=4
v3d_freq=500
force_turbo=1
avoid_pwm_pll=1
disable_splash=1

Commands used to do CPU tests:

vcgencmd measure_temp
sysbench --test=cpu --num-threads=8 --cpu-max-prime=50000 run

I ran the test multiple times until I reached the max temp for each setup.

Temp results:

With my original customized chipset cooler with 40 mm 5V fan = around 50 C

Without cooler = Over 80 C, thermal throttling warning visible

Ultimate Dual Fan-cooler with included thermal adhesive tape = 77 C + thermal throttling

Ultmate Dual Fan-cooler with copper plates and thermal paste = 70 C, no thermal throttling thou.

So yea, this device is piece of crap with the thermal tape, absolutely useless. And, when you apply copper plates with thermal paste, the results improve slightly.
As a ''straight-out-of-the-box-and-bolt-on-device'', it's not good, nowhere near of good, and even with improvements, it's still crap.

Conclusion: I'm not recommending this at all. Waste of money and time.

PiBoy

The dual fan test results are almost identical to what I got when I attached a fan with a heatsink to the CPU. Mine idled around 42 and topped out at 68 (with overclocking). However, I used the adhesive that came with the heatsink, which may have been that 9448 tape stuff, non conductive.

I am not convinced the SMC needs to be there, that second fan might not be doing anything.

spruce_m00se

@dd-indeed how do you run this test? I may run it on mine with the big cooler and see what happens

spruce_m00se

well i just did some heat tests,
27.5 ambient
51-52 on idle no fan
38 idle with fan
53 q3 playing with fan
67 q3 playing q3 no fan
Crashed.

from playing q3 with no fan in the past it used to give the temp warning sign after about ten mins, but this time it crashed before it got that far

DD-Indeed

@spruce_m00se

And you used stock clock settings for the Raspberry ?

Here's the test I tried:

(https://askubuntu.com/questions/634513/cpu-benchmarking-utility-for-linux)

''Actually there is a a tool named as sysbench.

You can install it with sudo apt-get install sysbench

To CPU benchmarking you can do like:

sysbench --test=cpu --cpu-max-prime=20000 run

where 20000 is like max event count.

--cpu-max-prime=20000 is optional, the default being 10000. I suggest to keep the default and fiddle with --max-requests instead (which is the number of operations performed)

Also note that by default this is a single-threaded test. For testing N cores you can use --num-threads=N (N = Any number you desire, I used 8 to properly stress the system. -DD), and compare results using the per-request statistics output.''

So, I used this command in my tests:

sysbench --test=cpu --num-threads=8 --cpu-max-prime=50000 run

And immediately after that, I checked the temps with this command:

vcgencmd measure_temp

I'm not expert on Linux commands, so maybe someone could create simple script from these, that could be easily accessed and used for these tests.

Translations

Just wanted to give my experience with these kits as I just got mine a few weeks ago, I have one of these dual fan kits in a Nespi case with the Pi overclocked to 1.35 and I have yet to get a single temp icon. Before the kit when I was just using heat sinks on the stock clock speed I was consistently getting the temp icon after about 45min of play time, so it does work and it is extremely quiet. Come on guys this thing cost $13 shipped from China, not sure how you can complain?

A Former User

It’s worked excellent for me. A little loud but other than that it’s really cooled my pi off.