3.0 @ 3.6/3.8 slow?

Discussion in 'Hardware' started by daba, 3 Jul 2004.

  1. daba

    daba What's a Dremel?

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    I recently overclocked my 3.0C which was at 3.6 to 3.8 (at 1,60 Vcore) because of some new RAM I picked up. Originally at 3600Mhz I would get a horrendous Super pi score of 41 seconds with most processes disabled and super_pi.exe priority set to realtime. At 3800MHz I could run Super pi again and various other benchmarks and got the score to 39 seconds. This is very slow for a 3.6 and a 3.8. Since the system crashed with 2xPrime95 at 3800MHz, 3750MHz, and 3700MHz and wouldn't boot with 1.625Vcore, I am currently testing back at a stable 3,6GHz. Anyone know why the 3.6 is performing so poorly?

    Here are Zeitgeist 2004.6's specs:

    3.0C @ 3.6; Vcore 1.575
    Asus P4P800 Deluxe (BIOS 1016)
    2x512 MB Kingston HyperX PC4000 @ 240 FSB running 1:1 (3-4-4-8)
    ThermalTake 480W Butterfly w/ Active PFC
    SP-94 w/ ThermalTake 92mm smart case fan

    I originally had some HardcoreCooling.com generic cas 2.0 PC3200 (2x512 MB) running 5:4 (2-3-3-6). I thought this was the root of my performance shortcomings, but apparently not.

    I should add that RAM did play a crucial role in this situation. Back when I had PC3200 I could not run any program above 3,6 GHz. With this PC4000 not only can I get into XP at 3,8 GHz, I can also run various benchmarking software (but it doesn't survive dual prime).

    What could it be?

    Thanks in advance,
    daba
     
    Last edited: 3 Jul 2004
    daba, 3 Jul 2004
    #1
  2. Mister_Tad

    Mister_Tad Will work for nuts Super Moderator

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    superpi relies very much on system bandwidth

    you either need ram at a moderate speed with very tight timings or ram at an insane speed with relaxed timings
     
    Mister_Tad, 4 Jul 2004
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  3. Froggy

    Froggy What's a Dremel?

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    Try reducing your clock speed a bit. i noticed that my chip actualy ran slower in benchmarks and stuff at its upper limits in speed. i reduced it a little bit and it runs great.
     
    Froggy, 4 Jul 2004
    #3
  4. Mister_Tad

    Mister_Tad Will work for nuts Super Moderator

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    runs slower at higher clock speed?
    that just doesnt make sense :confused:

    maybe at a higher clock speed the board uses a divider on the ram, which could make it run slower, but the only explanation other than that would be that the chip is too hot and it was throttling
     
    Mister_Tad, 4 Jul 2004
    #4
  5. Kameleon

    Kameleon is watching you...

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    And both of these options should not be turned on in the BIOS, auto-dividers and -throttling is not good for overclocking :)
     
    Kameleon, 4 Jul 2004
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