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IFC6410: Clocking the CPUs above 1GHz on Linux

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by Inforce » Wed Jul 01, 2015 7:56 am

Hi Anup, thanks for the detailed response.
It's good to hear it's just a cooling thing and not some drivers/software limitation.
I first tried with just a fan, which lowered the temperature from ~80C to ~50C, but that didn't increase the cpu frequency. I guess the fan itself is not enough. I'll try with your suggestion in the following days.
Many thanks!
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by Inforce » Wed Jul 01, 2015 7:56 am

Hello there,

1. Without heatsink: baseline performance: 1GHz
2. Add a small peel-and-stick heatsink to the APQ8064:
http://www.digikey.com/product…..ND/2615346 (Costs just $2.26)
Performance increases to 1.13GHz.
3. Couple the board to a metal chassis, add a spacer and two soft pad thermal conductor blocks.
These thermal conductors will be placed under the APQ and the PMIC, between the board and the metal chassis.
Spacer 4mm, M3 http://www.digikey.com/product…..ND/3727971 (cost: $0.25)
Soft pad 25x25x5mm http://www.digikey.com/product…..ND/3042370 (cost: $4.21)
The standoffs are 4mm in height, and the thermal blocks are 5mm in thickness. When the board is screwed down
on the metal chassis, the blocks are squished by 1mm ensuring good thermal contact between the board and the
chassis. Performance will now increase to the maximum of 1.73GHz. Test it with any realistic compute loads that
would demand higher performance from the CPU and the heat dissipation techniques should kick in avoiding
throttling down the frequency.

Cheers!
Anup
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by Inforce » Wed Jul 01, 2015 7:56 am

Hi,
I'm running the latest Linaro release on IFC6410 and I see that the max cpu speed is 918MHz.
I'm wondering is it possible to clock that up to the 1.7 GHz from the SoC specs?
Do I need to add some heatsink/fan to cool it down?
Thanks!
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