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G73 i7-720 OC

Discussion in 'ASUS Gaming Notebook Forum' started by bwerblo2, Aug 16, 2010.

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  1. bwerblo2

    bwerblo2 Newbie

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    Not seen very much info about it, last i was able to find is it cant be done any way other than the twin turbo mode. Anyone know of a thread that says how to OC the 720?
     
  2. Chastity

    Chastity Company Representative

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    You can use a program called setFSB to change the bus speeds. It is not free, however. Requires a $5 donation.
     
  3. loskings

    loskings Notebook Geek

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    I got the 820QM processor instead of 720 and have tried to acheive some results using SetFsb. In a way the application did what its supposed to, it raised the fsb/processor speed. However the performance in benchmarks and fps dropped just like it does when you enable twin turbo mode (twin turbo mode does the same as Setfsb if i understand it correctly). It pussels me and i havent yet found an answear to why you loose performance when it should be increasing. Perhaps its a cpu design thing, i dont know.....
     
  4. PulsatingQuasar

    PulsatingQuasar Notebook Consultant

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    Weird that. Sounds like another thing Asus has to find a solution to. A working turbo button.
     
  5. tijo

    tijo Sacred Blame Super Moderator

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    The performance drop is due to how the multipliers work with intel turbo boost. At stock bclk of 133MHz on the 720qm, the overall clock speed it 13 (12 + 1 due to turbo boost) x 133MHz (1.729GHz)

    With twin turbo, the bclk is raised to 142MHz if i remember correctly. Due to the higher fsb clock, turbo boost doesn't kick in so the overall clock speed is 12 x 142 (1.704MHz).

    That is when all four cores are used of course.

    In order to get an increase in performance, the fsb clock has to be increased enough and heat can become a problem if you overclock too much. Just take a look at the difference in CPU temperature when twin turbo is on.

    The bottom line is, you have to use setfsb to gain an increase in CPU speed. I saw a thread somewhere in the asus forums dedicated to OC the i7 on a G73 where it was successfully overclocked.
     
  6. Xellon

    Xellon Shinobi of the wind

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  7. loskings

    loskings Notebook Geek

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    Yes, thats the one i think he is refering to.
     
  8. WarWyrm001

    WarWyrm001 Notebook Consultant

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    This was discussed in detail in the G73 Benchmark thread
     
  9. HeavenCry

    HeavenCry Notebook Virtuoso

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    You didnt OC it enough to see a performance increase ;).
    You have to OC it more than what turbo boost does, since when youre OCing, the turbo boost doesnt kick in.
    I have overclocked my i7-820qm to 2,2 ghz on all 4 cores, so the performance increase becomes noticable. Havent tried more yet and i dont feel like it since i have no real use in overclocking the CPU.
     
  10. loskings

    loskings Notebook Geek

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    Ah, and since you to have a 820qm, how much did you move the fsb slider in Setfsb? Did you do anything else in Setfsb to make it work or was it just the slider you worked with?
     
  11. HeavenCry

    HeavenCry Notebook Virtuoso

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    Just the slider. I think i was at 157 or something like that... Not sure right now.
    Do it slowly though. A few steps, set clocks, again a few steps, set new clocks, repeat until you crash if you want to find out your limit ;).
     
  12. loskings

    loskings Notebook Geek

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    I just dont get it. These results dont make any sence, atleast not to me :D

    Sisoft Sandra CPU Arithmetic test

    Overclocked
    Setfsb slider @ 168
    FSB =152
    1978 Mhz
    Benchmark Results
    Aggregate Arithmetic Performance : 42.88GOPS
    Dhrystone iSSE4.2 : 50.81GIPS
    Whetstone iSSE3 : 35GFLOPS


    Stock
    Setfsb slider @ Stock (untouched)
    FSB=132
    1729 Mhz
    Benchmark Results
    Aggregate Arithmetic Performance : 44.63GOPS
    Dhrystone iSSE4.2 : 51.72GIPS
    Whetstone iSSE3 : 37.54GFLOPS
     
  13. NGX

    NGX Notebook Consultant

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    Will somebody please post the pll for the G73JH so I can use setfsb. I have searched for hours, tired of reading posts........
     
  14. NGX

    NGX Notebook Consultant

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    Nevermind, I just asked abo instead :)
     
  15. loskings

    loskings Notebook Geek

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    Let me know how it works for you. As you can see on my post above it didnt quite work as i thought it should.
     
  16. NGX

    NGX Notebook Consultant

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    Well I just set a new record for the highest clocked Corei7 720QM that I could find, possibly world record idk yet. Submitting all my benchmarks through hwbot.

    Click here
     
  17. loskings

    loskings Notebook Geek

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    Grats!

    Did you experiance any performance improvments when running benchmarks, for example sisoftsandra?
     
  18. NGX

    NGX Notebook Consultant

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    Massive improvements. I'm about to take first place for Super PI as well, just getting the finishing touches on it.
     
  19. smile_gerard

    smile_gerard Notebook Evangelist

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    How much temperature increase is there? It would be great if we could mod "twin turbo mode"
     
  20. NGX

    NGX Notebook Consultant

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    Well right now I've got my AC on max and like 5 fans blowing on the thing since I've been benching all night :D But it isn't to much of a temp increase because I am not upping any voltages.
     
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