AM4 DC input motherboard

Discussion in 'General' started by cleveland, Jul 25, 2018.

  1. cleveland

    cleveland Airflow Optimizer
    Thread Starter

    Are there any AM4 mobo with this kind of power input?


    The voltage, as well as the form factor (ITX or Thin-ITX) aren't relevant (at least for me), as long as the mobo could be powered by an external brick.
  2. ColorZepppelin

    ColorZepppelin Trash Compacter
    colorzeppelin computers

    These aren't AM4 but the info might help.

  3. el01

    el01 King of Cable Management

    From my knowledge, no. There is, however, the Sapphire motherboard with a soldered-on Ryzen APU (up to 8 cores, I think) that is STX...
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  4. cleveland

    cleveland Airflow Optimizer
    Thread Starter

    #4 cleveland, Jul 27, 2018
    Last edited: Jul 27, 2018
    Yeah, I own a A78F2-TI, equipped with an a8-7600. Awesome little piece of tech (after a few tweaks and a good cooling solution)!

    Now that storage and single core performance got to another level, i'm looking for a mobo replacement to my M350 case.

    The central idea here is to have a direct input mobo + m.2 SSD + Ryzen 2400GE (35w) + the lowest profile heatsink possible (NH-L9a?), all inside the M350!
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  5. jtd871

    jtd871 SFF Guru

    When Ryzen2 drops on 7nm, I would hope the power efficiency would be make a DC-powered board (~35W TDP CPU SKUs) more likely.
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  6. ColorZepppelin

    ColorZepppelin Trash Compacter
    colorzeppelin computers

    You might consider the AMD V1000 APU motherboards, just by chance I came across the one below. Has a 4-pin connector on the IO side.
    Axiomtek GMB140 - 12V input
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  7. cleveland

    cleveland Airflow Optimizer
    Thread Starter

    I might consider it IF I can find a good/reliable comparison betwen 2400GE and V1000 (or any other embedded APU).

    Features i wanna see compared:
    - power consumption
    - thermal dissipation
    - power input vs performance output (cTDP or anything similar)
  8. el01

    el01 King of Cable Management,37408.html
    The APU itself is not the V1000, but rather the V1000 series, with the top-of-the-line 4-core 8-thread Vega 11 V1807B comparing to the 2400G.

    The boost clocks and base clocks on the V1807B are lower by around 0.1GHz for boost and 0.25GHz for base compared to the 2400G, mostly to accomodate the 35-54 watt TDP. Expect more successful cooling with the V1807B than the 2400G given the same cooler.

    Power consumption should be rather similar, considering similar clocks and similar physical features. I would estimate a power consumption of around 63 watts under load.

    What might be of concern is GPU frequency, as on the V1807B, GPU frequency is at (max) 1300MHz. I'm pretty sure it's the same on the 2400G, but if we see power throttling, that may be a problem.

    Hopefully this answers a few of your questions... I myself am pretty confused... :p
  9. cleveland

    cleveland Airflow Optimizer
    Thread Starter

    I don't wanna sound harsh or anything, but do you have any source for those assumptions? I've searched online a lot for those ccomparisons, but have no success at all and the link you gave here talks solely about the specs (info that can be found everywhere).
  10. el01

    el01 King of Cable Management

    It's fine, I understand where you're coming from ;)

    These assumptions are based on the TDP and clocks of the processor. Given a lower TDP (which measures max amount of heat produced, as far as I know), the amount of heat produced by the processor will naturally be lower. Lowered clocks generally means lowered heat, the inverse of higher clocks producing more heat, so that reduces heat as well. Additionally, lowered clocks mean lower power consumption, and that hopefully is self-explanatory.

    My logic here was to provide very very conservative estimates of heat/power, based off of a processor we already know exists. Since I'm kinda far away from testing equipment, I decided to assume that a clock reduction of 0.35 GHz may result in a power consumption reduction of 2 watts. Given how power efficient the Zen architecture is, that seemed rather reasonable (the Vega part may be of concern though..). Additionally, the lowered TDP is a rather easy way for me to provide a comparison of cooling power needed.

    My assumptions were mostly based on TDP being lower and lowered clocks meaning lowered power consumption.

    Hopefully this explains my thought process well enough...

    (EDIT: Evidently I wasn't thinking properly when I estimated power consumption at 63W, that's based off of TDP, a measure of heat! Either way, power consumption characteristics should be similar to a 2400G, and considering (probably) the inability to overclock the V1000-series processors, they will stay low compared to an overclocked (and better performing) 2400G).
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  11. cleveland

    cleveland Airflow Optimizer
    Thread Starter

    I really like the way you think and how it suits my needs!

    I hope those itsy-bitsy boards come down to market ASAP, so i can put my old xbox to RIP in peace! lol
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