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Thread: Raspberry Pi is a Low-Power, Credit-Card Sized Computer

  1. #51
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    Let's say you bought yourself the latest Raspberry Pi, the Raspberry Pi 4B with 8GB of RAM, what can you do with it? And what couldn't be done with earlier Pi's?

    Let me first stress that the 8GB, together with the ARM Cortex-A72 allow for a 64-bit OS -e.g. Raspberry Pi OS to be used to the fullest extent.
    From the Raspberry Pi 3B on (and even the 2nd edition of the Raspberry Pi 2B) the board had a 64-bit ARM Cortex-A53, but with only 1 GB of RAM. The Pi 4B was originally introduced with 1, 2 and 4 GB, the latter just having enough RAM to be able to run a 64-bit OS (and more than enough to run a 32-bit OS). The 1 GB model has been withdrawn since a few months and a 8 GB model has now been added to the line. That is as much RAM as is there in the PC of my missus, and twice the RAM as in the PC of my daughter! (she uses a hand-me-down Socket 775 Dell that won't accept more than 4GB and is due for a Ryzen 5 upgrade, though with that new B550 chipset a Ryzen 3 from the 3000 series might do too...)

    What projects have apps for ARM/Linux? And do they cater 64-bit?
    *Does anyone have an overview for WCG? COVID-19 and MIP can be done 32-bit natively and 64-bit with a hack at least*

    If you have installed a 64-bit OS and want/need to run 32-bit apps, you might need to install 32-bit libraries to do so.
    In case of wanting to run 32-bit apps under a 64-bit OS you get a message like "This project doesn't support computers of type aarch64-unknown-linux-gnu" from that project.
    You then need to add:
    Code:
    <options>
      <alt_platform>arm-unknown-linux-gnueabihf</alt_platform>
    </options>
    to the cc_config.xml file
    Last edited by Dirk Broer; 08-07-2020 at 12:50 PM.

  2. #52
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    Interesting option to both stack and cool Raspberry Pi's, nVidia Jetson's, ASUS Tinker Boards or Odroid-C1's, -C2's or -C4's:
    GeeekPi's New Raspberry Pi Rack Case Stackable Cluster Case with 120mm RGB LED Cooling Fan 5V

    One can always replace the carnival outfit with a better performing non-RGB fan...
    Last edited by Dirk Broer; 09-01-2020 at 02:22 AM.

  3. #53
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    SBC extreme cooling: the quest for more power

    52Pi -sometimes written as S2Pi- are developing themselves as the Noctua of SBC cooling: High-end air coolers with good performance.

    After we had the Ice Tower cooler for the Raspberry Pi that shaves some 30-40°C off the Pi's operating temperature we got a specialized 4-pin Nvidia Jetson Nano cooler featuring a far bigger cooling block and two heat pipes, that even managed to shave some 40-45°C off the Nano's operating temperature!
    As it uses a 4pin fan, just imagine what a 2cm thick Noctua 40mm 5V fan could do..
    Their lastest SBC cooling product is a 2-pin low-profile Pi cooler, looking (at first glance) very much like the Nano cooler, but with a far smaller cooling block and a thinner radiator, that manages to keep the Raspberry Pi's just a tad cooler than the 'big tower' model can -partly due to blowing air down over the board itself too. Gone however is the possibility to add a second fan in push-pull combination.

    What does this have to do with a quest for power? The most capable 32-bit ARM SOCs are eight-cores that all suffer the same problem: overheating and hence down throttling.
    My Odroid-XU4's Samsung Exynos 5422 SOC sometimes runs as slow as 1100/1000 MHz due to down throttling, while it can do 2000MHz/1400Mhz on its Cortex-A15 respectively Cortex-A7 cores. And the same holds, due to less cooling, even more true for the Cortex-A15/A7 equipped Allwinner A80 in my Cubieboard 4's, that is advertised at the same speeds as the Odroid-XU4. It surely holds true for the [standard] totally un-cooled Allwinner A83T Cortex-A7 Octa-Core of the Banana Pi M3, that is supposed to run at 1800 MHz: all three octa-cores will overheat and throttle down. I have yet to hear of an enthusiastic Banana Pi M3 user on that account.

    So we need more cooling, and 52Pi is going to supply it. It is just that they themselves do not know it yet. I will try to tie-wrap my way into getting their low-profile ice-tower cooler securely onto my Odroid-XU4 and my Cubieboard 4, as the normal way of fitting them will not work. I'll keep you informed.

    BTW: There's one SBC that doesn't need tie-wrapping contraptions: The ASUS Tinker Board -size-wise a replica of the Raspberry Pi-. The low-profile Ice Tower Pi cooler ought to fit like a glove...
    Last edited by Dirk Broer; 11-22-2020 at 10:51 AM.

  4. #54
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    Can you get better cooling than with the Out-Of-the-Box (OOB) solutions of 52PI? Yes, but it takes some out-of-the-box thinking to make a Do-It-Yourself (DIY) extreme cooler.
    When searching for '52pi Ice Tower' in Google I came across 'Sub-20$ DIY Cooler DESTROYS 52pi Ice Tower', so before you order a 52Pi cooler, first read this.
    The bloke who wrote it had thought of using a cheap Chinese northbridge cooler for PC mainboards when he couldn't find the holy grail of chipset cooling: the discontinued Noctua NC-U6.
    If you happen to have one lying around: grab it and use it, either on a SBC or on a X570 mobo -or sell it.

    The contraption built looks like this:
    Cooling performance was like this:
    I'll keep looking for more extreme solutions...

  5. #55
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    NeoGen is offline AMD Users Alchemist Moderator
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    Now that is some serious passive cooling, now we just need a case designed for that shape.

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