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Re: Fan and heat sink

Posted: Tue May 31, 2016 3:58 pm
by cmoetzing
How are your temps without the fan?

Re: Fan and heat sink

Posted: Tue May 31, 2016 4:45 pm
by hoppertw
Heat sink is a passive cooler. Fan is active cooler. The best cooler is active plus passive and the bad one is only the passive cooler. I stop the fan and try 95% to 100% loading for over 20 minutes. All the 4 cores run above 70C to 75C. In fact, the cooler effect using both is near the product but not the sum.
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NOFAN.jpg (71.22 KiB) Viewed 9815 times

Re: Fan and heat sink

Posted: Tue May 31, 2016 7:38 pm
by cmoetzing
Thx, I think passive will work for me. Cant wait until my heat sinks arrive.

Massive thermal throttling.

Posted: Tue May 31, 2016 10:53 pm
by eldaria
So been running it for a few hours, ambient temperature 27C, It seems stuck on 480MHz.
Tried to reboot, but it won't go up.

So I shut it down, and after an hour, I turned it back on.
Now it runs at 1840MHz, but quickly drops, and after just 10 minutes i'm again stuck on 480Mhz.

I'm using the acrylic case.
I have seen a few people adding cooling, is that really needed?

Re: Massive thermal throttling.

Posted: Tue May 31, 2016 10:59 pm
by tony359
can you check the temperature of your CPU? You can use HWmonitor http://www.cpuid.com/softwares/hwmonitor.html
My LP with 20°C reaches 80°C and it's not in a case. I reckon a case would be a problem with 20°C, not to mention 27°C.

Re: Massive thermal throttling.

Posted: Wed Jun 01, 2016 3:30 am
by michaelvdb
Putting a few rasberry pi heatsinks copper and/or aluminum ones does a lot of good for heat dissipation.
In my office (say 24 degrees), LP peaks (in case) at about 75 degrees.
At home (27-30 degrees), LP peaks about 85degrees at full load. With a simple 5v fan belowing into the bottom, it runs at 44(idle) - 75(full load)

Re: Massive thermal throttling.

Posted: Wed Jun 01, 2016 7:31 am
by trygame901
Are you looking at the clock speed while idle or under load? While idle it will clock way down to save power and then when there is a load it will clock up. After while that the CPU starts to heat up it will start to clock down again. I ran mine at 100% load for 24hrs and in the end it was running ~.7ghz. The only time I ever saw 480 was while its idle.

Re: Massive thermal throttling.

Posted: Wed Jun 01, 2016 8:42 am
by tony359
good point, the Cherry Trail will automatically throttle the speed depending on load. It's very normal that it sits at 480Mhz when idle.

[SOLVED] CN2 5V connector as board power? yes.

Posted: Wed Jun 01, 2016 6:39 pm
by drussell1234
Does anyone know if we could use the CN2 connector to power the Board?
Looks like you could plug 5v directly into the cn2 jumpers on the motherboard to supply power to the system?
Without a Board Schematic, I am unwilling to try it! Hopefully one of the developers of the board can answer this question. It would be easy to get more amperage to the board thru this connector vs the micro USB.

Thanks,
drussell1234

Re: LattePanda cooling mod

Posted: Thu Jun 02, 2016 8:53 am
by fgaine
LatteROFLCOPTER wrote:OK so I decided to install some mini heatsinks to see what happens.
While the LP has been stable for me, I'm not too happy with the high temps especially since it hasn't been hot weather.

The 'shield' (Really a Heat Spreader) will conduct the heat from the processor and spread it out over a larger surface area which is a good thing. Because of this, I decided to install the mini heatsinks directly on to the spreader.

I have some copper ones (commonly used on RPi) and an aluminium one, now as we all know copper is a much better conductor for heat. I still decided to use the aluminium one as it should at the very least help (I used one in my router which was overheating, and ever since there hasn't been any issues).

I also have the LP sitting on a small fan which is powered by USB (it's very quiet).
I don't quite understand how a fan underneath the case dissipates the heat. Is it blowing cold air inside the case or trying to absorb the hot air from the inside?