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Thread: Help me pick the right PSU. Please?

  1. #1
    Constant Bitrate
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    Help me pick the right PSU. Please?

    hey guys, im trying to pick the right PSU for me. Im planning a micro-ATX board with AMD Sempron 64 1.8GHz + 1HDD,LCD and probably a couple of USB and a USB Hub. I tried calculating the Wattage it would need, but I think i'd rather go with anything above 150W just to be safe and for future expansion.

    Was wondering if anyone has any good ideas, i've heard good things about DSATX, but I cant figure out if it has a startup/shutdown controller.

    Any good recommendations would be greatly apprecited.

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    The DSATX has a built in SDC.

    You should read this FAQ to help you in your quest: http://www.mp3car.com/vbulletin/advf...iew&advfaqid=6
    Have you looked in the FAQ yet?
    How about the Wiki?



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  3. #3
    Constant Bitrate
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    yeah ive read the FAQ, the problem is on the CPU page I cant figure out what my CPU core voltage is..

    here are the specs.

    Sempron 3400+
    (1.8GHz - 256KB) 1.25V
    (?V~?V) ?V ?A 35W 78 C
    Sempron 3400+
    (1.8GHz - 256KB) 1.4V
    (?V~?V) ?V ?A 62W 69 C

    as you can see its either 62W or 35W..huge difference...but I am just going to assume its 62W.

    looking at DSATX specs..
    5.0 Volts +/- 2% 12 Amps Nominal, 13 Amps Peak
    3.3 Volts +/- 2% 10 Amps Nominal, 11 Amps Peak
    12.0 Volts +/- 2% 12 Amps Nominal, 15 Amps Peak
    5.0 Volts Standby +/- 2% 1.5 Amps
    -12.0 Volts +/- 10% 100 mA

    12V rail x 12Amps = 144W , so this should be able to power my CPU.

    The Xnarc I am planning on getting says this.

    # Operating Voltage Range: DC 11V ~ 24V, 1A
    # Power Supply: DC 12V
    # Power Consumption: <8W

    It seems like the Xenarc takes unregulated power, which would mean I could run power straight from the distro block coming from the battery, so this wont put any additional load on the PSU.

    Am I correct in my assumptions?

    Thanks in advance.

  4. #4
    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by MastaShake View Post
    yeah ive read the FAQ, the problem is on the CPU page I cant figure out what my CPU core voltage is..
    You need to identify the core architecture. There should be some printing on the CPU itself that you can cross reference on different websites that can help you identify the CPU.

    as you can see its either 62W or 35W..huge difference...but I am just going to assume its 62W.
    Not a bad idea. The DSATX can handle that pretty easily.

    It seems like the Xenarc takes unregulated power, which would mean I could run power straight from the distro block coming from the battery, so this wont put any additional load on the PSU.
    You are correct.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  5. #5
    Constant Bitrate
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    got a question. DSATX pulls 20AMPS

    and per Xenarc specs its pulling 1AMP ???
    Operating Voltage Range: DC 11V ~ 24V, 1A

    so im assuming if i run an 8ga wire from the battery fused with 21AMP fuse, into a power distro where i run 2 12ga wires (one fused with 1amp and the other 20amp). im pretty sure that would be correct.

    my question is, how do I ground the Monitor?? its not like there is a ground terminal on the monitor..or is there??

    help me out please..

    thanks.

  6. #6
    FLAC is for flaccid parksgm's Avatar
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    Quote Originally Posted by MastaShake View Post
    got a question. DSATX pulls 20AMPS

    and per Xenarc specs its pulling 1AMP ???
    Operating Voltage Range: DC 11V ~ 24V, 1A

    so im assuming if i run an 8ga wire from the battery fused with 21AMP fuse, into a power distro where i run 2 12ga wires (one fused with 1amp and the other 20amp). im pretty sure that would be correct.

    my question is, how do I ground the Monitor?? its not like there is a ground terminal on the monitor..or is there??

    help me out please..

    thanks.

    You don't need a 21 amp fuse...the fuse is there to protect the wiring, not your equipment. If your equipment suddenly starts drawing more current than the wiring can handle, the a properly rated fuse will blow to prevent the WIRING from overheating, melting, and possibly causing a fire in your car. So, you need to determine the proper fuse by determining the maxiumum amount of current your wiring can safely handle, not by how much current the equipment hooked to the wiring draws. In fact, the fuse you choose should be rated a bit greater than the maximum current you expect the connected equipment to draw....otherwise, you'll be replacing fuses all the time!

  7. #7
    Constant Bitrate
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    thanks that makes sense, how do I measure how much current the wire can safely handle?

    have a quick link? thanks in advance.

  8. #8
    Constant Bitrate
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    Depends on the size of the wire you are using. Larger wire, 8G -18G for power to components like amp and PC. Smaller guage, 20G-26G for signals.

    Here's a chart to give you some idea: http://www.powerstream.com/Wire_Size.htm

    Jay

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