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Thread: M1-ATX + AMD Athlon Mobile!!

  1. #1
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    Smile M1-ATX + AMD Athlon Mobile!!

    I got so tired of the M10000, no 800x480, no cpu power and lousy onboard audio
    After some testing and fiddling around I found a solution for my existing M1-ATX.

    I'm using the following components:
    Mainboard: ASUS A7N8X-E (Deluxe)
    CPU: AMD Mobile Athlon +2400 (running at 1.07 GHz)
    Memory: 1 x 256 MB DDR 2700
    Graphics card: ATI Radeon 9000 64 MB DDR DVI+TV
    Soundcard: Soundblaster Audigy 2 ZS
    HD: 2.5 Travelstar

    I measured the following currents under continous use:
    +5 V 7 A peak 9 A (not including HD)
    +3,3 V 4 A
    +12 0,4 A
    No problem for the M1-ATX. Unless I start with serious 3d-gaming in the car.

    But I also tried with an ASUS A7N8X-VM/400 with integrated graphics, no luck, to much load on the +5 V (>9A). I think it feeds the graphics with +5V.

    I will do some further tests before throwing it in my car. The M1-ATX looks so tiny compared to the ATX mainboard. It's possible to make a very nice and low casing with help of a AGP+PCI risercard http://linitx.com/product_info.php?c...roducts_id=431

  2. #2
    Raw Wave rando's Avatar
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    That's right at the 50W combined limit for the 5V/12V rails on the M1-ATX.

    5V @ 9A = 45W
    12V @ 400mA = 4.8W
    Combined Power = 49.8W

  3. #3
    MySQL Error MatrixPC's Avatar
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    Quote Originally Posted by olja
    But I also tried with an ASUS A7N8X-VM/400 with integrated graphics, no luck, to much load on the +5 V (>9A). I think it feeds the graphics with +5V.
    This exactly the problem I have. The Sproggy with 10A on 5V didn't cut it, so I have to modify the board a little to make 15A on 5.0V and only 5A on 3.3V. That works but not 100% perfect. Normally it will work fine, but if you put in a DVD/CD ROM, the system will free untill the spin up process is done. Thru Asus probe, I can see the 5V line is dropping, but not the 12V line. My conclusion is that the 5V line is week. Also I read somewhere on the net (pcperpective ???) and the guy test that the AMD CPU with Asus mobo (most Asus mobo) use most power from 5V rail.

    I am in the process of modifying my PSU to make another add-on 5V for HD and DVD ROM.
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    Quote Originally Posted by MatrixPC
    This exactly the problem I have. The Sproggy with 10A on 5V didn't cut it, so I have to modify the board a little to make 15A on 5.0V and only 5A on 3.3V. That works but not 100% perfect. Normally it will work fine, but if you put in a DVD/CD ROM, the system will free untill the spin up process is done. Thru Asus probe, I can see the 5V line is dropping, but not the 12V line. My conclusion is that the 5V line is week. Also I read somewhere on the net (pcperpective ???) and the guy test that the AMD CPU with Asus mobo (most Asus mobo) use most power from 5V rail.
    I measured only 0,8 A @ 3,3V rail with the A7N8X-VM/400!

  5. #5
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    @Olja: Did the A7N8X-E take the AMD Mobile without any issues? I read some where that some sort of mod is required to get the mobile to work. I am also looking into this combo and like to know if it would work.

  6. #6
    Newbie halve85's Avatar
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    how did you measure the power cosumption of the 5v rail?
    By putting all the 5v rails of the ATX connector together?

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    Quote Originally Posted by kingtut
    @Olja: Did the A7N8X-E take the AMD Mobile without any issues? I read some where that some sort of mod is required to get the mobile to work. I am also looking into this combo and like to know if it would work.
    I've found only one minor problem. It's not possible to set the Vcore below 1,525 V. My CPU specified for 1,35 V runs happily on 1,525 V. I don't know if this affects the power req..

    No mods req.

  8. #8
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    Quote Originally Posted by halve85
    how did you measure the power cosumption of the 5v rail?
    By putting all the 5v rails of the ATX connector together?
    Yes, I bundled all of the 5 V cables together.

  9. #9
    Newbie halve85's Avatar
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    Quote Originally Posted by olja
    I've found only one minor problem. It's not possible to set the Vcore below 1,525 V. My CPU specified for 1,35 V runs happily on 1,525 V. I don't know if this affects the power req..

    No mods req.

    Can't you undervolt the CPU by Software in windows?
    Undervolting will affect a much lower power consumption (much more than underclocking!!!)

  10. #10
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    Quote Originally Posted by halve85
    Can't you undervolt the CPU by Software in windows?
    Undervolting will affect a much lower power consumption (much more than underclocking!!!)
    I tried to find software that will allow me to change Vcore in Windows, no luck. Anyone?

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