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David Taylor <
david-taylor@blueyonder.co.uk.invalid> wrote:
> On 09/04/2024 13:52, Adrian wrote:
> > I`m currently running a Pi2, which has a BME280 (via a hat) and a SSD
> > attached to it. The Pi is now starting to struggle to generate graphs
> > for my home website, so I`m thinking of swapping it for a Pi4. A
> > rummage online doesn`t seem to fully answer my questions.
> >
> > Apart from the Pi4, to upgrade, I know that I will need a bigger power
> > supply and a HDMI adapter lead, but after, things are a bit vague. Can
> > I get away with the Pi4 without any additional cooling, or do I need a
> > heat sink or fan, and if so, how do they get on with the hat ? The
> > space it is in has had a temperature range of -1 to 40 degrees C, the
> > mean across that time is about 15.5C.
> >
> > TIA
> >
> > Adrian
>
> Adrian,
>
> No problem with the other suggestions.
>
> When you say "starting to struggle" what have you measured? Are you running
> out of memory, CPU power, disk I/O, or network I/O? I think it
would be useful
> to know what exactly in your system needs changing.
>
> It`s possible that a Pi 3B+ might be a sufficient upgrade (but can you still
> get them?).
>
Yes, but a 1Gb Pi 3b costs more than a 1Gb Pi 4 so there`s not much
point in buying one unless the lower power consumption is really
important.
> The Pi-5 creates quite a bit more heat than the Pi 4, and has some software
> compatibility issues, so unless you really need the 5, stick to
the 4. (I have
> both here). If you are not running headless, the Pi 400 has a heatsink and
> keyboard built in. I have a couple here and have been very pleased with them.
> One even runs both Windows and Linux, that`s using the Twister OS. It uses
> about 2 GB of its 4 GB memory, and averages 10-12% CPU.
When idle there`s little difference, e.g. :-
"We also ran a test to measure the heat generated by the devices
during use. The comparison shows that both Raspberry Pi 5 and
Raspberry Pi 4 generate similar amounts of heat. In terms of power
consumption, the PI4 and PI5 have similar power consumption when not
running programs. However, during video playback, there is only a
small difference of 0.2 watts in their power consumption."
The Pi 5 *can* use more power but when doing the `same thing` the
power consumption is pretty close to that of the Pi 4.
--
Chris Green
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