Opteron 165 - Upgrade to X2

CPU by SidneyWong @ 2006-01-17

Last year I had the pleasure in getting my first taste of Upgrade to A64-Venice 3000+ . The high overclock headroom and ease of thermal output plus the low price made the Venice 3000+ a terrific buy. So much buzz on the Opteron Dual Core S939 since November last year; I was hoping I would get the same result my Venice delivers.

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Results after disappointment

Results after disappointment :

Perhaps, 2x Prime95 may not be the only measurement my editor added. This guy always cheers people up, after I bla bla bla at our forum about how bad this thing overclocks. Followings are the "things" I did, using what I think how I may use a dual core processor.

  • Burning DVD while I am playing Battlefield II.
  • Testing my ego crushing SuperPI 16M + 3DMark benching
  • Working on my year end tax with Spreadsheet, listening to music while burning a DVD movie for my girl friend.
  • Converting my video to MP4, again playing Battlefield II.

    I really can't come up more in what I could do with this dual processor. Maybe, buying this processor alone is an ego trip. Besides, who the heck would buy a dual processor just to run 2xPrime95. I decided to show you what I ran through with the Opteron set at 300 x 9, 1.55 & 1.524 volt despite the fact that I have tried it on 2.6, 2.5 and 2.4G.

    SuperPI 8M and 3DMark03

    Madshrimps (c)
    Click to enlarge


    At 1.55 vcore, the CPU temp shot up to 65°C, I'm more concern on the 63°C PWMIC temp.



    SuperPI 16M and 3DMark05

    Madshrimps (c)
    Click to enlarge


    At 1.525 vcore, CPU temp dropped to 55°C, PWMIC down to 52°C; a more acceptable range.


    S&M CPU test log at 1.525 vcore

    Madshrimps (c)
    Click to enlarge



    2 threads of TOAST

    Madshrimps (c)
    Click to enlarge


    CPU temp now shot up to 65°C and PWMIC exceeded 65°C.




    Finally

    Two days into tweaking, I was dumb founded not to try memory divider and loose memory timings. Perhaps, the GSkill is not as efficient with X2 memory controller, or the tight timings are not welcomed, or the Opteron dual core memory controller is not as robust as those found in single cores. Using a higher divider so that memory FSB is kept below 260, keeping FSB below 1GHz and loading AMD dual core driver , running 2xPrime95 becomes doable:

    The screen shots below from right to left - 2.4, 2.5 and 2.6Ghz

    Madshrimps (c) Madshrimps (c) Madshrimps (c)


    I started to smile once more. However, look closer to the PWMIC temps I was hesitant to go try higher. Here is the summary of CPU and PWMIC load temps running 2X Prime95. Note: 1.35 (default), 1.4 and 1.5 vcores are BIOS setting; screen shots from CPU-Z have lower vcores than BIOS.

    Madshrimps (c)


    I have since run all settings above over 7-hour 2x Prime-stable with similar temp results. Until I find a better way to lower the PWMIC temp which may well be requiring better power management in the motherboard circuit, I am very satisfied in running this system at 2.5GHz for the sake of stability and temp in the summer months ahead.


    Update: added 20/01

    After toying with the Stock HSF, the capability of the stock delta fan with temp sensor was not quite kick-in due to the installation of my Chill Vent with which the intake air was cool enough keeping the senor circuit to remain open.

    After I short circuit the sensor leads allowing full speed and the use of DFI Smartguadian software to regulate the speed (I set it to wide open throttle at 60°C) so that my ears don't have to listen to the loud noise when stressing two cores comes in occasionally.

    Relocating the 2x40mm fan right on top of the PWMIC heatsink lowers the PWMIC temp by 10°C making it more "acceptable".

    Madshrimps (c)


    I raised the BIOS vcore to 1.55V and here is the result:

    Madshrimps (c)


    As you could see the Delta is running at >5,200 RPM, loud by any standard. Yet, it shows how well the Stock HSF is working, unlike the old ones.

    Madshrimps (c)


    Using CEM DT-8850 digital sound meter (18" inches away)

    2,800 rpm system sound level 46.7 dBA
    5,200 rpm system sound level 51.5 dBA


    I fired a double barrel shotgun - both barrels at the same time, the pellets do not travel twice as fast. But, doubling the number of pellets they do cover more ground. So… what do I choose, single core or dual? ->
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