1.3GHz

[stuartiannaylor]

I am presuming the Rock64 max clock speed is set in the DTS.

I just wondered if 1.3GHz had been chosen as a safe level without cooling as the Rock64 is supplied.
Did anyone do any testing with passive and active cooling at higher clock speeds or did 1.3GHz seem to be the limit.

I am presuming with the 1.5Ghz rating its a junction temperature cooling decision and wondered if a kernel/image might be supplied at higher clockspeeds for those who want to employ increased cooling solutions.

Overclocking is not recommended;

however,  its your board.  You can do as you like with it-- but the images need to be provided for best engineering practices. As always with any good engineering setup, somebody will always want to experiment with overclocking even though its a dangerous practice that reduces the life of the processor and is prone to processing instabilities;  anyone is free to over-clock to their hearts content.

IMHO, intelligent operation of the system should always employ the proper ondemand scaling governor ( or other scaling governors as required ) so that the system is not always cranking at the "hottest" .  Over-clocking almost always introduces instability and an element of uncertainty;  as well diminishing returns.

Do as you will.

The RK3328 is a 1.5Ghz device, so essentially we are not overclocking.
"Quad-Core Cortex-A53,up to 1.5GHz" is how rockchip advertise the RK3328.   <snip>

Yes, you are over-clocking;

...  there is more involved than the cpu|gpu clock.  The clocks are all interrelated, and memory and memory speed is a key factor , particularly for stability.

We have a small baby issue in that these boards are coming out with a mix of memory chips -- some at the PC-1866 and some at the PC-1600.  Although some of the boards have the faster memory, the boards are all "spec'd" for PC-1600;   you don't want to be messing around with the clock(s)!   Do so as an experiment sure, but for reliable operation and stability, leave them alone.

The cpu frequency is separate from the DDR controller which is in the RK3328 and a bit confused about  "the boards are all "spec'd" for PC-1600" irrespective of problems of PC-1866 or PC-1600 the cpu frequency will make that no better or worse.

I was just interested if anyone had any knowledge and any interest in tinkering but actually if we don't go past the the published maximums then we are not overclocking.
Pointless argument though but maybe the wiki should be changed to Quad-core Cortex-A53 up to 1.3GHz CPU
http://wiki.pine64.org/index.php/ROCK64_...chitecture

Irrespective of Marcus says I am thinking there might be a little room to 'over clock' if you have active cooling as there is a little bit of headroom until you hit the specified maxes then maybe you could push that a little with a slight 'overclock'

It seems the max voltage was becoming close currently set at 1.3 for to achieve 1.3GHz with a specified max of 1.35 with a supply of 1.48.
http://opensource.rock-chips.com/images/...170309.pdf
Dunno just thought I would ask?

The pre-production ones apparently ran hot and just wondered what voltage and frequency they where set to?
Where they originally what its says in the RK datasheet Max CPU frequency of A53 1.4 GHz