Voltmodded 7900 GS

Discussion in 'Videocards - NVIDIA GeForce' started by RossCorp, Dec 5, 2006.

  1. RossCorp

    RossCorp Master Guru

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    GPU:
    EVGA 570GTX SLI
    7900 GS Volt Mod

    Well, I just received my Conductive Ink pen about 30 seconds ago, so I thought I'd make this post first, then hope everything goes well!

    First of all, I have an XFX 7900 GS, stock clocks are 480/1400. I tested with my multimeter first just to confirm, and the core is at 1.3v and the memory at 2.18v stock. Seeing as how my core is at 1.3v instead of the standard 1.2v, I'm not sure which voltage I'm going to end up with as this is sort of a trial and error thing, lol!

    Also, my current max stable overclock is 617/1784! And by max stable, I mean that I can run any benchmark, game, or "burn-in" utility and it won't crash or artifact, for hours on end. That is stable to me, not just stable ENOUGH to run a few quick benchmarks, then lower back down for fear of damaging your card.

    I'll post back in a few hours with the results and benchmarks (hopefully)!!! :rock:
     
    Last edited: Dec 10, 2006
  2. deathvirus

    deathvirus Ancient Guru

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    600/1750 seems awesome for the 7900GS .. maybe a tab higher with better cooling ...
     
  3. otaku

    otaku Ancient Guru

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    i think i would just leave standard with those kinds of clocks but who knows maybe 700 core and 1800 memory is in sight
     
  4. RossCorp

    RossCorp Master Guru

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    GPU:
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    Well, my computer still works! Thank God. First of all, I decided to move a fan from the top of my P180 into the bottom chamber to get some airflow down there. That took me over an hour, as I had to completely re-route all my cables to fit the fan. Not sure about it now, as my MB temps have risen a bit, but it is done and I am never touching all those cables again!

    So because I have the XFX version and its core comes from the factory with 1.3v, I wasn't sure which mod to do, as I wasn't sure if a "mod" had already been done. What I mean is I wasn't sure if the .2v mod would bring mine to 1.4 (like all the rest of the 1.2v ones) or if it would be 1.5v. Well, as I should have known, the .2v brought my GPU to 1.505v.

    [​IMG]

    I did the .2v mod in the above image. Red=0.05v.....Yellow=0.1v.....Purple=0.2v

    This is so simple I recommend anyone who wants a little extra juice to do the mod. I am going to lower it to 1.4v as I don't have watercooling, yet, but even at 1.4v I'm guessing 650ish is possible.

    Now, for the results!!!

    All of the tests were done with the components to the left with those identical settings. Now, I apologize as this isn't an apples to apples comparison. I had run all the tests before the voltmod with my 7900GS set at 615mhz core, 1750mhz memory (except 3dmark03 which was at 1700memory).
    The tests after the voltmod were all done with the core at 701mhz, and the memory at 1602mhz (except 3dmark01 was at 1750mhz and 3dmark03 was at 1700).
    I had hoped to run everything identically so as to limit the variables, but unfortunately I think I was pushing that gddr3 a little too hard. The wierd thing is that I ran all the tests before the voltmod last night, and it was fairly toasty in my room, probably around 24c. I opened my window while I did the tests today, and the airtemp was probably around 10c, so I don't know why the ram didn't want to hold up today. But anyways, I've determined that I won't push the ram past 1600, as you really don't gain much from overclocking the ram anyways.

    Test --- 480/1400---615/1750---701/1602

    3DMark01---37580---41287---42951

    3DMark03---19585---23515---24787

    3DMark05---8386---10448---10959

    3DMark06---4676---5795---6150

    AquaMark3---121296---136326---139961

    F.E.A.R.
    Min.---31---41---43
    Max.---141---179---195
    Avg.---62---80---85

    FEAR was run at 1280x960, everything maxed except only 2x AA, no soft shadows.

    So there you have it! Not too shabby. As for 3dmark06, it ran it fine, but with the new patch you have to view your results online. Well, it's been out for what, four or five days, and I couldn't get online to see my results!!! Thanks Futuremark, that was the one I was looking forward to seeing the most!

    Anyways, I'll post the '06 result once I find out what it is! And I'll update once I do my suicide runs with my room frozen and my cpu (hopefully) around 3.8 or more. Once again, this was the easiest performance gain I have ever seen or achieved! Very simple, and temps hardly have moved. I'm going to put 1.5v to the test tonight with a two or three hour BF2 session, see what the temps are like then, but so far they aren't bad, only a few degrees above what they were before. My idle/load temps before were ~42/60, and at 1.5v so far I haven't seen anything higher than 60 yet, which is a good sign!!!

    Very happy with the way this turned out!:bigsmile:
     
    Last edited: Dec 10, 2006

  5. volcom

    volcom Maha Guru

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    GPU:
    XFX XXX 7900GTX @ 749/1927 VX2025VM
    not bad for the 7900gs, thats great, imagine if you got wc on that bad boy:D!
     
  6. Cheeze

    Cheeze Member

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    yay now i can feel safe moving on with mine. :) also which more is important? the core or ram? right now at stock everything i have 600/1600. evga 7900 GS
     
  7. deathvirus

    deathvirus Ancient Guru

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    the core gives a much better improvement .. 6800GT stock 350/1000 did 5k's in 3DMark05 and the same at 400/1000 did just over 5.5k's ...
     
  8. bug77

    bug77 Banned

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    It looks like 150MHz less for the mem barely compensate for 100MHz gain on the GPU... Not good. Luckily for me, I have 1.2ns memory!
     
  9. DOorDIE

    DOorDIE Member Guru

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    GPU:
    XFX/GF 7900 GS (500/1.6)/256
    what was he temperature you got ....... when you did all this .. idle and on workload....???
     
  10. CanadianTSi

    CanadianTSi Member

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    GPU:
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    Both will yeild Improvements but the Core will give better results.

    Once you have your core running over 700mhz then it really starts to get bandwidth hungry and memory clocks get much more important.
     

  11. RossCorp

    RossCorp Master Guru

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    So far it seems my idle/load temps with the 1.5v mod aren't that bad at all! Before the mod I was getting ~42/60c, and after the mod I've been seeing ~43/61c! 1c degree difference!!! I did rearrange all the cables in my case though, and moved my soundcard down a space to give more clearance for my graphics card, so that might have had something to do with the temperatures. Because the temps have hardly changed, I think I'm going to leave it at 1.5v for a few days, just to see how it handles it.

    Yeah, again, I wish I would have just done all the tests with the memory at 1600 flat, just to have an even comparison, but for some reason the memory won't do 1750 anymore with a few of those benchmarks. I tried it in-game though, with a couple of games, and I didn't see any artifacting what-so-ever. Time to voltmod the memory I guess! :rock:

    I noticed that too! The memory clocks really don't have much of an effect at, say, 550mhz core. But on a couple of those benchmarks you can see how the difference from 480>615 is quite large, but the difference from 615>701 wasn't as drastically different. I'm positive this is because, as you stated, the memory is having a tough time keeping up.

    On a side note, who has had success with the pencil-mod? How well does it work, and would it just be easier and safer to solder on another resistor? I'm looking to do this mod in the near-future, once I've completely figured out the gpu!
     

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