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    How low volt did you go for undervolting the HP dv5t, P8600 CPU?

    Discussion in 'HP' started by Chango99, Sep 13, 2008.

  1. Chango99

    Chango99 Derp

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    Hey guys, i'm just wondering for those who undervolted on the dv5t with the p8600 processor.

    On the highest multiplier, 9.0x, I dropped it from 1.0625V to 0.9625V, then tried 0.9375V, instantly crashed, on 0.9500v I think I crashed after a bit, less than 10 minutes. Seems the most stable is .9625V, and that dropped me about 10C.

    The lowest you I can go on multipliers is 0.9V, and i just tested it on the 8.0x multiplier, after 45 minutes, no error. According to RM clock its running at 2.13GHz with this multiplier (on the 9.0x multiplier its 2.39 GHz, should be 2.4GHz but not much of a loss, it just rounds down).

    Now, assuming the multipliers require less voltage but the lowest it will go is .9V, I can just set all the multipliers from 8.0x and lower to .9V, am I right?
     
    Chango99, Sep 13, 2008
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  2. Greg

    Greg Notebook Nobel Laureate

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    Make sure you are stressing the processor out, using SuperPI or wPrime or Prime95 (highly recommend Prime95). For a few hours using your voltages.

    Sometimes undervolted processors are okay when barely loaded, and crash only when a significant load is applied.
     
    Greg, Sep 13, 2008
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  3. Chango99

    Chango99 Derp

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    Yeah I was stressing it with ORTHOS, as for a few hours, I haven't tested it past 50 minutes yet.
     
    Chango99, Sep 13, 2008
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  4. gengerald

    gengerald Technofile Extraordinaire

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    When I was undervolting, I would cheat and cut down to my absolute lowest with 5 minute tests, bump up 1 or 2 then do a long test (overnight). This cut down on the time needed to get results. I also did some, yet minimal, real world testing with video encoding in Premiere. GL
     
    gengerald, Sep 14, 2008
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