4 ms·
Those are mostly useless (they only slow down temperature changes a little). Only thing that really helps is active cooling / moving the air. You also have to
by megous 7y ago
Those are mostly useless (they only slow down temperature changes a little).
Only thing that really helps is active cooling / moving the air. You also have to figure out the placement of the board. The air will move via convection, and if you get air movement from a hotter part of the board (PMIC) to the SoC, you'll not improve things much.
I don't think perf gains in Rpi4 are of much use, if it idles at 65°C (my ambient temperature is ~32°C at home) and has to throttle down to <1GHz under persistent load.
- close04 7y ago> they only slow down temperature changes a little That already helps a lot if you don't need to maintain full power for long periods. It gives just enough thermal inertia to handle spikes without throttling. For extended periods you may need to move to bigger heatsink or active cooling.
- BubRoss 7y agoARM A72 chips use out of order execution, which already gives 3x the performance.
- penagwin 7y agoI'm curious what benchmarks you've seen that actually show a 3x compute improvement? Most of the benchmarks I've seen show a ~30% improvement in CPU compute, while I/O has improved tremendously, as well as the memory. But again I've only seen ~30% improvement in CPU workloads, a far cry from "3x the performance" that I keep seeing.
- BubRoss 7y agoYou may have seen GPU comparisons. https://www.raspberrypi.org/magpi/wp-content/uploads/2019/06/2019-06-21-15_40_11-Window.png https://www.raspberrypi.org/magpi/wp-content/uploads/2019/06... https://www.raspberrypi.org/magpi/wp-content/uploads/2019/06/2019-06-21-15_41_55-Window.png https://www.raspberrypi.org/magpi/wp-content/uploads/2019/06...
- megous 7y agoSpeedometer (chrome) may be more dependent on mem bandwidth which is 2x of RPi 3.
- BubRoss 7y agoWhat makes you say that? Dynamic languages are usually chasing pointers which is something that out of order execution helps with tremendously.
- megous 7y agoThis is supposedly some TODO app being run repeatedly in Chrome, so it's much more than a JS benchmark. And Chrome as a whole is memory hungry.
- beatgammit 7y agoFor my use case, the main attraction for me in the RPi4 is the additional RAM and better IPC/ISA, not necessarily the higher clock (though higher clock is certainly welcome).
- Dylan16807 7y agoTripling the surface area doesn't help? And those fins should help convection in most orientations.
- megous 7y agoYou're not trippling the surface area. (Part of) the board already serves as a heatsink. You need to count that in.