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Thread: 6 amps running prime95

  1. #1
    Variable Bitrate
    Join Date
    Apr 2004

    6 amps running prime95

    I bench tested my setup today. It's a single board computer with an onboard LCD controller, a pentium 3 800, 256 megs pc133 , 20 gig 7200rpm hard drive, a teac notebook cd-rw, and a 12" LCD. I'm using a 250 watt AT power supply run off a 400 watt inverter.

    The current draw was much lower than I thought it would be. The inverter pulled 4 amps at 12.4 volts when the rig was idle. i ran prime95 and when the cpu was loaded it pulled 6 amps at 12.2 volts. That means the whole rig only pulled 72 watts at full load!?!?!? 72 watts at the battery?!?!?!?!

    could this be true?

  2. #2
    Low Bitrate
    Join Date
    Nov 2003
    Apeldoorn, Netherlands
    thats low, but a p3 800mhz doesn't draw much "watts" (20.8watt) and your lcd wont draw more then 20watts orso, so it could be possible yeah
    Newbee, sorry for my bad english. lol
    Trying to built a carmp3 systeem

    own psu: max788, pt5071, pt5024

  3. #3
    Raw Wave Rob Withey's Avatar
    Join Date
    Apr 2000
    Bedfordshire, UK
    Doesn't sound completely unreasonable. My P233MMX setup draws about 2.5A under load with a VFD.
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  4. #4
    Variable Bitrate
    Join Date
    Apr 2004
    I figured stepping the voltage up to AC and then back down to dc would have killed the effeciency.

  5. #5
    Constant Bitrate
    Join Date
    May 2004
    Efficiencies are heavily dependent on the brand of inverters and also what you are powering. I've seen some DC-AC inverters as low as 70% (no-namers and cheapies) which claim '90%' efficiency and some which work as advertised near 93%-95% efficiency. With inverters, you do get what you pay for.

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