Directions for Heat Sink?

bronco

matteobp replied at 2015-7-21 16:27
Thanks for the good explanation. I have a Orange Pi Plus (H3 based), and it is ok for me to read t ...

Well, the H3 isn't supported by mainline kernel/U-Boot and not even all informations seem to be available: http://linux-sunxi.org/H3
So you're dependent on the (non existing) software support your hardware vendor provides :-)


When you look at this thread CPU3 killed off for thermal budget then you get strings to search for. Download the SDK from the first link above and grep through it.

Two thermal values seem to be exported via sysfs (but who knows what is what? Seems noone has a clue)

Maybe one is the thermal sensor from the SoC and the other the PMU's? Since noone provides highres images for the boards I have no idea where the PMIC/PMU might be (most likely the small chip next to the power connector): http://sunxi.org/Xunlong_Orange_Pi_Plus


A simple test is to use a non-conductive glove, monitor the temperatur in a loop and touch SoC and afterwards PMU and see how values 'react' (touching a chip with your finger will always lead to immediate heat dissipation between both surfaces)

1. while true ; do
   
2.     cat /sys/class/thermal/thermal_zone0/temp
   
3.     cat /sys/class/thermal/thermal_zone1/temp
   
4.     sleep 1
   
5. done

Copy code

matteobp

Thanks very much for the information.
I am increasingly convinced that I wasted my money buying the Orange Pi Plus.

bronco

matteobp replied at 2015-7-21 17:37
I am increasingly convinced that I wasted my money buying the Orange Pi Plus.

Why not donating it to the linux-sunxi community like https://groups.google.com/forum/#!topic/linux-sunxi/sMMqCjUfoLE

I think it depends on the use case for the board in question. In case you want to replace a NAS (IIRC this was your plan?) a SoC without SATA is clearly the wrong choice. But tricky marketing (advertising the board as SATA capable since 'there is a SATA connector on the board') does its job. People think 'hey it's cheap, has SATA and has twice as much CPU cores than A20 based boards. It must be faster' (which is a spectacular false assumption as anyone can easily realize when you look at older Marvell SoCs used in NAS boxes: for example the 88F6281 which features a single-core ARMv5TE CPU @ 1-1.2GHz, but 2 good Gbit NICs and 2 SATA ports: Any device which this SoC easily outperforms an Orange Pi Plus with its quad core CPU and slow USB-to-SATA-bridge when it' about NAS useage).

Maybe this is the reason why vendors like Xunlong or eg. SinoVoip don't support the linux-sunxi community by donating a few new devices for which mainline support is missing. The linux-sunxi community will do the work if anybody's interested in the hardware. But this will take some time. And in the meantime the hardware vendor already tries to sell the next version of their boards featuring an octa-core SoC since customers are always dumb enough to believe 'the more cores, the better' (who understands SMP challenges? Who understand cache coherency and the like? Who understands I/O latency and so on?)

bronco

BTW: I still hope this is true: https://olimex.wordpress.com/201 ... e-with-a10-and-a20/

gaara

The PMU chip is cold on my board, I can touch it even if the app says 51°C. But the SoC is very hotter !
BTW, I'm using Android and the app "Cpu Temp"
It's about 30°C in the room, so 20°C difference is not surprising

magicse

The best dimension size of heat sink for OPi2 35x30mm. After long search was found next variant 35x25.

ralves84

I found this...
http://www.aliexpress.com/item/F ... For/1472143066.html
(from AliExpress Android)

magicse

I think 14mm is so high, isn't it?

doubleatheman

I got this, It may not fully cover the cpu, but I think it will be better than not having a heat sink at all.

50 cents

http://www.aliexpress.com/item/1 ... nk/32325757526.html

magicse

My experiments with heat thinks ))
1  Copper Heat Sink from Raspberry Pi. Size Dimensions 14x12x5.5mm (very small and not cover SOC) US $0.88 x 1 piece

2 A better option Pure Aluminum heatsink from Raspberry Pi Ver. 2.0 One:14 x 14 x 6 mm and another  two:9 x 9 x 4 mm (but it too small) US $0.98 x 1 Lot

The best  option 25x35x10mm LED Power Cooler Aluminium Heat-sink US $0.49 x 1 piece