[DISCUSSION] Fans/Heatsinks/CPU Cooling Mods

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User avatar
LatteROFLCOPTER
Posts: 45
Joined: Mon May 16, 2016 6:00 am

Sat May 28, 2016 7:30 am

This device does need better cooling.

If you use 30%+ cpu usages most of the time (web browsing...most media playback...) then the included 'cooling solution' simply isn't good enough.

At the very least have a small fan blow on to the bottom of the board (where the cpu/gpu are located).

Mine used to peak in the mid 80s (100% cpu using prime95, gets even hotter if gpu is also stressed), after adding some heatsinks on to the included heatspreader It's now in the low 70s, but can still reach the low 80s if both the cpu and gpu are maxed...though take note that I no longer get any cpu throttling due to heat.

User avatar
schuschu
Posts: 2
Joined: Fri May 27, 2016 6:09 pm

Sat May 28, 2016 9:23 am

So basically with the supplied case the device will always overheat (you basically have 1 mm between table and the only heat-vents). Has anyone tried to attach a 5V fan to the arduino pins and PWM it (best case feeding the current temp via uart)? Maybe the I2C pins (using SMBUS) could also work, but I have no idea how...

Anyway I flipped the device over and it has gotten better (I still overheat but at least I now reach 1GHz)

User avatar
LatteROFLCOPTER
Posts: 45
Joined: Mon May 16, 2016 6:00 am

Sat May 28, 2016 9:41 am

Yes the cooling solution simply isn't good enough out of the box.
If you look at tablets that use the same CPU, they use the entire backing of the unit as the heatsink so they function much better.

If you are lucky to live somewhere that has ambient temps of 20c or less at all times then you should be fine most of the time.

I wouldn't want to try using one of these while in india....it would thermal throttle before you can do anything at all.

The LP is a great little device, but without the extra help cooling it...well you won't have a very good experience.

I saw a post of the KS page from the LP team that they are working on a cooling solution, whatever that means.

User avatar
hoppertw
Posts: 6
Joined: Sun May 29, 2016 8:57 am

Sun May 29, 2016 9:18 am

A 4cm x 4cm fan and 2 heat sinks are good enough to reduce the temperature. The most important is the LP should not be enclosed.
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User avatar
cmoetzing
Posts: 17
Joined: Sat May 28, 2016 3:30 pm

Sun May 29, 2016 11:06 am

I was thinking about these:
https://www.amazon.de/Kupfer-Chipsatz-K ... %C3%BChler
https://www.amazon.de/Enzotech-RAM-K%C3 ... 5XNF6E0RBE
https://www.amazon.de/Enzotech-Corp-MOS ... %C3%BChler

They are small, you can put several on or cut one in half if needed.

But then I saw this post, those things look massive compared to the ones above: viewtopic.php?f=5&t=158
50° is nice!

User avatar
aodxxl
Posts: 7
Joined: Sun May 15, 2016 10:12 am

Sun May 29, 2016 11:29 am

https://drive.google.com/folderview?id= ... sp=sharing

It's an old video card heatsink with a laptop blower style fan chopped and hot glued inside( i work at an it repair shop so i had broken ones arround. You can refurbish some of them by removing the blade , cleaning and lubricating the inside with fine oil)
Idle temps are 45 with an ambient of 25
Load Temps are 61 with an ambient of 25

I did use thermal paste to get better thermal conductivity between the hetasink and shield and i changed the termal pads under the shield ( had no impact whatsoever on temps but i had them so what the hell)
The fan is conected to one of the 5v outputs on the panda that's usually reserved for sensors.It spins are verry low rpm for some unknown reason but it's perfect because it is inaudible from +40cm away and it cools it suficiently .

NOTE* using large blower style fans from laptops with large blowers will not work. For those fans you need an initial burst of current to get the fan spinning and the latte can't provide that unless you hook it up to an usb port( downside with usb ports is they spin at max rpm and are noisy)
You need a slim blower style fan. Mine is 5v 50ma 45mm diameter.

I made a few tests with passive cooling and got promising results by direct contact with the procesor.
Removed the shield from the underside , removed the thermal pad and put some thermal compound with a 30X45mm pure copper heatsink. I got 72 load temperature but no way to secure the heatsink to the procesor and make it look decent. ( the contacts on the underside are risen above the level of procesor and its verry difficult to attach any heatsink without trimming the contacts.) Unfortunately no pictures with that expriment.


P.S. This forum still blows !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Having relog everytime i have to post untill it works

User avatar
kamesenin
Posts: 2
Joined: Fri May 20, 2016 6:44 am

Mon May 30, 2016 10:41 am

Hey
I would like to share my own small mod for cooling. I have bought cheap fan for Raspberry Pi on amazon, I had to remove mesh from a case (bottom part) and attach power. I was way easier than I have expected. Now my device is performing under stress without a problem. I have also attached heat sinks (also for raspberry), but they were taking too much space. cheers!
Imgur small gallery

User avatar
LatteROFLCOPTER
Posts: 45
Joined: Mon May 16, 2016 6:00 am

Mon May 30, 2016 10:53 am

Can you try running prime95 and Furmark at the same time for 15minutes and post the max temp.

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hoppertw
Posts: 6
Joined: Sun May 29, 2016 8:57 am

Mon May 30, 2016 1:00 pm

Room temperature is 27 C, less than last test. 95% to 100% load over 2 hours. The fan current is 0.08A. Low fan speed and wind is enough if you put a big heat sink and coating with thermal adhesive. The dimension of heat sink is near 40mm x 40mm x 20mm.
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User avatar
aodxxl
Posts: 7
Joined: Sun May 15, 2016 10:12 am

Mon May 30, 2016 7:42 pm

Only the underside needs to be cooled . You could get a smaller heatsink and mount the fan directly on that heat sink
I found a super low profile heatsink but i am missing a fan. And the only 5v fans available here are the noctua ones and those cost an arm and a leg.

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