1.3GHz

[MarkHaysHarris777]

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.