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Thread: Asus P5W DH Deluxe MCH Overclocking Response

  1. #1
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    Asus P5W DH Deluxe MCH Overclocking Response

    I've tried my best to represent this mathematicaly. R^2 = 1 and it matches what I have seen very well so this has got to be pretty damn close to the absolute truth. Should help those than are going to high FSB to match their vMCH for best chance of success.

    FSB = 166.67 * vMCH + 170

    Funny how the numbers turn out...there's 166.67Mhz in the equation...hmmm.

    So, if you want 475Mhz FSB:
    475 Mhz = 166.67 * vMCH + 170
    vMCH = ~1.83v


    -FCG
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    Last edited by freecableguy; 08-21-2006 at 05:58 PM.

  2. #2
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    nice work

  3. #3
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    Impressive - now I'm beginning to see why the X6800 with unlocked multis may be worth the price with not having to push 400+ FSB.

    Any idea how this graph compares if using the Bad Axe?

  4. #4
    Overclocking X.I.P. Otaku
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    Kyosen-san had posted his actual results testing fsb and vmch over at OCX using the Asus... seems like a vmch mod will be needed to help those with lower Multis:

    Kyosen wrote:

    Vfsb is fixed at 1.50V
    Corsair PC2-5400UL(v1.2) 512MB x2, Vdimm=2.427V
    E6700 @ x7 multiplier

    Here 'Max FSB' is SuperPI 1M run-complete limit

    Vmch : Max FSB
    1.56 : 419.4
    1.60 : 431.3
    1.65 : 446.8
    1.70 : 460.5
    1.75 : 470.1
    1.80 : 474.8
    1.85 : 477.8
    1.90 : 480.8
    1.95 : 482.0

    Vfsb mod seems almost no beneficial,
    but Vfsb 1.60~1.65 may give +1~2 click on SetFSB...

  5. #5
    So did you really try this with your board?
    Intel FTW!

    Beanna

  6. #6
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    Some very interesting info here, just what I've been hoping to see.

    The question now is, what is a safe limit for the voltage both for benching and day to day usage?

  7. #7
    xtreme energy
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    What is stock and max in bios without mods?

    I guess 1.5 is stock
    ...

  8. #8
    1.65v I believe.
    Intel FTW!

    Beanna

  9. #9
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    there are 4 data points on the graph, these came either from myself or others with the same board.

  10. #10
    Who did 500FSB?
    Intel FTW!

    Beanna

  11. #11
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    micutzu

  12. #12
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    Interesting stuff, good to know.

  13. #13
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    So the max FSB is solely limited by the amount of volts you're willing to push? Does this mean that watercooling the nb might yield higher FSB?

  14. #14
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    Pretty useful info.
    Thanks


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  15. #15
    xtreme energy
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    hmm, might try dry ice for NB
    ...

  16. #16
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    cool just the kinda info. i needed...thanks

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  17. #17
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    I'm limited to 424 max bench with 1.65 vmch in bios
    Xeon 3060 L631B115 max 4680 superpi SS 10.904
    Asus P5B deluxe + vdrop vcore vddr2 vmch mods
    2x1go crucial ballistix pc8000
    2x1go crucial ballistix pc6400
    8800 gts 320 // x800xl // 9250 pci
    corsair hx 620 // seasonic s12 500
    DOD chilly1 R402a
    watercooling // zalman9700

  18. #18
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    Wow, that really applies with my Asus Board.

    At 430 FSB my board shut down everything.

    Hmm, perhaps i have to mod it.

    free
    nethands [/B]
    <--

  19. #19
    Overclocking X.I.P. Otaku
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    Kyosen-san was getting higher with the lower vmch with his watercooled NB.

  20. #20
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    Quote Originally Posted by freestylercs
    Wow, that really applies with my Asus Board.

    At 430 FSB my board shut down everything.

    Hmm, perhaps i have to mod it.

    free
    = but at 426
    Xeon 3060 L631B115 max 4680 superpi SS 10.904
    Asus P5B deluxe + vdrop vcore vddr2 vmch mods
    2x1go crucial ballistix pc8000
    2x1go crucial ballistix pc6400
    8800 gts 320 // x800xl // 9250 pci
    corsair hx 620 // seasonic s12 500
    DOD chilly1 R402a
    watercooling // zalman9700

  21. #21
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    That's on air, right ? Now we need the table with better temps in the chispet

    Nice work dude!

    Hopefully newer chipset's OC's higher, i'd like to get my incoming 6700@4,5ghz without vmch mod... For 24/7, for benching i dont mind vmods...
    Asus P5K Premium//Intel E6600@3,6ghz//Corsair PC6400C3@500 4-4-4-12 2,2v//8800GTS G92//Audigy 2 ZS//SeaSonic M12 700W & LianLi V2000B

  22. #22
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    this is air cooling with AS5 on the NB, the stupid "cover" removed and some airflow across the heatsink from an internal radiator fan (note: not a fan pointing directly at the heatsink). idle @ 1.8v is ~40C and full load at ~44-45C. Ambient at ~21-22C. Better cooling might certainly skew the graph to the left significantly.

    -FCG

  23. #23
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    At least its feasible to use a better cooling solution on the P5W DH, with its good placement of NB, unlike say, DFI Ultra-D

    Do most aftermarket nb coolers fit the P5W DH?

  24. #24
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    Quote Originally Posted by gocchin
    Kyosen-san was getting higher with the lower vmch with his watercooled NB.
    Im looking into watercooling myself, i think the MCW30 might be a good choice, listed as compatible with P5WD2, should work on the P5W-DH.

    Thanks for the chart Kris.
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  25. #25
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    I've put artic ceramic and I have removed the cover and no gain

    he is cooled with 80mm fan

    I will make vmch mod
    Xeon 3060 L631B115 max 4680 superpi SS 10.904
    Asus P5B deluxe + vdrop vcore vddr2 vmch mods
    2x1go crucial ballistix pc8000
    2x1go crucial ballistix pc6400
    8800 gts 320 // x800xl // 9250 pci
    corsair hx 620 // seasonic s12 500
    DOD chilly1 R402a
    watercooling // zalman9700

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