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Effects Of Overclocking: ATI

Graphics Overclocking: Getting The Most From Your GPU
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Even in 2D mode, the video memory of the Radeon HD 4870 always runs at its full clock speed. Using a tool like RivaTuner, you can underclock the graphics chip, resulting in savings of up to 22 watts. The card also runs 5 degrees Celsius cooler. This has no effect on its noise level, though, since the fan speed profile doesn’t slow the fan down.

In 3D mode, power consumption can increase by up to 14 watts as a result of overclocking. The cooler is able to keep the card’s temperature constant, compensating for the higher heat generation by turning up the fan speed. The not-so-pleasant side effect is an increase in noise, jumping from a comfortable 40.6 dB(A) to a more unpleasant 46.4 dB(A) at maximum speed. At medium loads, the fan exhibits an uneven noise level. When the card reaches a temperature threshold of 70 to 71 degrees Celsius, the fan spins up, only to slow down once the temperature drops below 67 degrees, until it hits 70 degrees again.

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  • 20 Hide
    dingumf , July 27, 2009 6:20 AM
    What the hell, I thought this was a guide to overclocking the GPU as the title reads "Graphics Overclocking: Getting The Most From Your GPU"

    Then at the end Tom's Hardware screws me over and writes "Conclusion: It’s A Tie"

    Isn't this a tutorial?
Other Comments
  • 20 Hide
    dingumf , July 27, 2009 6:20 AM
    What the hell, I thought this was a guide to overclocking the GPU as the title reads "Graphics Overclocking: Getting The Most From Your GPU"

    Then at the end Tom's Hardware screws me over and writes "Conclusion: It’s A Tie"

    Isn't this a tutorial?
  • 9 Hide
    Anonymous , July 27, 2009 6:32 AM
    they tell you how to overclock using CCC or riva tuner, or evga precision, they also tell you, overclocking = more performance at the cost of more power. what else do you want?
  • -2 Hide
    dingumf , July 27, 2009 6:54 AM
    joeman42What is really needed is a "continuous" OC utility that can detect artifacts during actual use and adjust accordingly. I've noticed that my max OC tends to change each time I test and depending on the tool I test with (e.g., atitool, gputool, rivatuner, and my favorite, atitraytool). Some games, l4d in particular, crash at the slightest error. Others such as COD and Deadspace are somewhat tolerant. Games like Far Cry 2 and Fear 2 don't seem to care at all. It would be nice if the utility could take this into account.As for the tools themselves, Atitraytool has far and away the best fan speed adjuster, the dual ladder Temp/Speed is a model of simplicity. Plus, it can automatically sense a game and auto OC just for the duration. Nothing like this exists on the NV side (you must explicitly specify each exe). Unfortunately, I am on a NVidia card now and Rivatuner is pretty much the only game in town for serious tweaking. IT IS A DESIGN DISASTER! random design with no discernable structure. A help file which consist solely of the author bragging about his creation, without explanation as to where each feature is implemented or how to use it. And no, scattered tooltips is not an acceptable alternative. It took forever to figure out that I needed to create a fan profile and then a macro and then create a rules to fire the macro which contains the fan profile just to set one(!) fan speed/temp point (and repeat as needed). Sorry for the rant, but I really hate Rivatuner!


    Oh hello. That's what OCCT is for.
  • -1 Hide
    nitrium , July 27, 2009 7:12 AM
    Rivatuner works just fine with the latest drivers (incl. 190.38). Just check the Power User tab and under System set Force Driver Version to 19038 (or in the articles case 18618) - no decimal point. Be sure that the hexidecimal display at the bottom is unchecked. All Rivatuner's usual features can now be accessed.
  • 0 Hide
    masterjaw , July 27, 2009 8:08 AM
    I don't think this is intended to be an in-depth tutorial like dingumf perceives. It's just for people to realize that they could still get more from their GPUs using tools.

    On the other hand, I don't like the sound of "It's a tie". It looks like it is said just to show neutrality. ATI or Nvidia? It doesn't matter, as long as your satisfied with it.
  • 1 Hide
    quantumrand , July 27, 2009 8:43 AM
    I must say, the HD 2900 is a great card. I picked up the 2900 Pro for $250 back in 2007 and flashed the bios to a modified XT bios with slightly higher clocks (850/1000). The memory is only GDDR3, but with the 512bit interface, it really does rival the bandwidth of the 4870. I can get it to run Crysis at Very High, 1440x900 with moderately playable framerates (about 25fps, but the motion blur makes it seem quite smooth). Really quite amazing for any 2007 card, let alone one for $250.
  • 3 Hide
    quantumrand , July 27, 2009 8:46 AM
    Just a bit of extra info on the 2900 Pro...

    The Pros were bassically binned XTs once ATI realized that the card was too difficult to manufacture cheaply (something about the high layer count it takes to make a 512bit PCB), so in order to sell their excess cores, the clocked them lower and branded them as Pros. Additionally, they changed the heatsink specs as well, adding an extra heatpipe. Because of this, the Pros could often OC higher than the XTs, making them essentially the best deal on the market (assuming you got a decent core).
  • 3 Hide
    Ramar , July 27, 2009 9:05 AM
    Overclocking a GPU generally isn't worth it IMO, but sometimes can give that extra push into +60fps average. Or to make yourself feel better about a purchase like myself; one week after I bought a 9800GTX they came out with the GTX+. A little tweaking in EVGA Precision brought an impressive 10% overclock up to GTX+ levels and left me satisfied.
  • -1 Hide
    manitoublack , July 27, 2009 9:34 AM
    I run 2 Palit GTX295's and have had great success with palit's "Vtune" over clocking software. I believe it works with cards from other vendors as well. Easy to use and driver independent.

    Cheers for the great article
    Jordan
  • 2 Hide
    KT_WASP , July 27, 2009 10:07 AM
    Quote:
    Conclusion: It’s A Tie


    I didn't know they were in competition until I read that.....I too thought this was about overclocking a GPU in general, not which card you should buy. Once again Toms throws that little barb at the end to stoke the fires.

    I think they do this constantly to get more website hits.. If the can get a good ol' fanboy war on every article, they will get people coming back over and over again to add fuel to the fire. After all, the more hits they get, the more they get paid from their sponsors. Which BTW, seam to be taking up more real estate then actual content on this site these days.

  • -1 Hide
    kayvonjoon , July 27, 2009 10:16 AM
    are u serious, man??
    I have 730 core clock on my evga gtx 260, 24/7.
  • -1 Hide
    amnotanoobie , July 27, 2009 10:37 AM
    RamarOverclocking a GPU generally isn't worth it IMO, but sometimes can give that extra push into +60fps average.


    I think it becomes important when the game you're playing hovers at 24+ fps, that minor/major OC might make your game from stutter hell to just about playable. I had a game before that I was able to set to mid-high settings but the fps hovered at 25fps, the minor OC helped me push 30fps+.

    At that time that was the only game I was playing and spending money to get a vid card to play this one game imho wasn't worth it. The viable cards that I could buy at that time were 8600GT(this thing is a joke), 8800GTS 320MB(too expensive back then), 2600XT(a worse joke), 2900(a heat monster).
  • -1 Hide
    unknown_2 , July 27, 2009 10:43 AM
    I think they are not using the the ATT correctly.

    As you can see here, I underclock my 4870 to 200/250 with just 0.5v

  • -1 Hide
    unknown_2 , July 27, 2009 10:44 AM
    http://i474.photobucket.com/albums/rr107/agent47_1/hd4890_027.jpg
  • -1 Hide
    unknown_2 , July 27, 2009 10:45 AM
    sorry, copied the wrong link...
    here it is.......

    http://i474.photobucket.com/albums/rr107/agent47_1/att.jpg
  • -5 Hide
    wh3resmycar , July 27, 2009 1:47 PM
    Quote:
    Back in its day, ATI’s Radeon HD 2900 XT was a very fast card.


    the author of the article had to be joking.
  • -5 Hide
    IzzyCraft , July 27, 2009 1:55 PM
    Against the 8800GT it was very fast, fast like a rocket(8800) vs a turtle(2900)
  • 5 Hide
    KT_WASP , July 27, 2009 2:09 PM
    wh3resmycarthe author of the article had to be joking.


    The HD 2900XT was a fast card. Not as fast as Nvidia's flag ship 8800 line-up, but not to far off. They were hot and power hungry, but not slow.

    I think that most people remember the disappointment of the real-world performance of the HD 2900 series after all the hype and projected performance the card had on paper at that time. Going by the specs it looked to be a 8800 killer, but then it came to market and did no such thing. This is what I think people remember the HD 2900 series most by.

    But, if you look past that, it was still a fast card. At that time it was beating CrossFired X1950XTX's and SLI'ed 79050 GT's, and even 7950GX2's in SLI.

    So yes, in its day it was a fast card. Was it the fastest? No, but that doesn't mean it was a slow card by any means.

    I think that people need to remember that at that time Nvidia broke all the molds with their 8800 series. It is a credit to Nvidia that they were able to bring performance levels to a new high. But, don't disregard the 2900 series as slow cards.
  • -1 Hide
    unknown_2 , July 27, 2009 3:40 PM
    2900xt was a fast card. Just that it can a little too late. And during that time, nVidia 8800 line up was really really rocketing.

    I still consider nVvdia 8800GTX as one of the finest, yet most expensive card that I nvr own. 8800GTX is legendary. Even by todays standard, it still rocks.
  • 0 Hide
    bildo123 , July 27, 2009 3:54 PM
    I have a XFX 4870 1GB and using ATI Tray Tools DOES let me underclock AND undervolt my card just fine. In fact I use the awesome auto-overclock feature. Whenever it detects that a game is opened it switches to a profile of your choice, my OC, being 855/1000. Also, if you have an old game, like Diablo 2, that doesn't need a full OC, you can add EXE's to the exception list say it stays on the 'idle' profile. I don't know off the top of my head exactly but at idle, its around 350/450 and the voltage is a tiny pinch above 1v, around 1.083 or something like that. According to GPU-Z the core draws 2.5x less amperage 11A compared to 25.5.
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