How To Overclock Your Graphics Card for Free

Overclocking Guide: How To Speed Up Your Graphics Card for Free

Here is a quick overclocking guide. Basically, to overclock your graphics card (or speed up the graphics card), you need RivaTuner and FurMark.

The overclocking is achieved in two steps:

  • 1/ GPU overclocking: increase core speed by 5MHz with RivaTuner and check stability with FurMark. Repeat until you see artefacts / glitches. At this moment drop speed by 5MHz until you don’t see artefacts anymore.
  • 2/ Memory overclocking: set GPU core to default clock and overclock memory like you did for the GPU core.
  • 3/ Apply both overclocking speed and check global stability with FurMark. Adjust settings if necessary.

There are two kinds of artefacts that can appear when clocks are too high:
small dots: GPU core clock is too high
large splashes: memory speed is too high.

This news shows a nice example of artefact with FurMark:

Overclocking: artefact with FurMark

So, from the previous explanation, the squares you see on the furry donut are due to a too high memory clock.


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  • Rado

    Hi i have xfx 9500 gt 1GB and I did so i increased about 100 mhz on gpu and 40 mhz in memory its stable i can increase more but tempreture while doing the stability test reaches 78 is this bad or something or its ok and i can overclock more? no dots or things appear just tempreture get high also is it ok to increase my fan speed to 100% or that will damage it

  • 78°C is okay. You can overclock a little bit more (up to 85°C but not more).

  • Abhishek Dey

    I have a XFX GeForce 8500GT.
    i increased my GPU core spreed from 450MHz to 600MHz
    Memory Speed from 400MHz to 480Mhz and Shader Unit Speed to 1300MHz from 1024MHz.

    Somtimes i see few artifacts such (as dots) in Far Cry 2 but not in other Games like Crysis and Mirror’s edge.

    temperature remains constant around 78 degree Celcius.

    Is it a safe temperature for this card?
    Is the artifact only generated for a particular game? So should i decrease the Core Speed?

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    yes, to answer your question Abhishek, that is an ok temp. GPU’s run pretty hot, around 70 C to 80 C. 85 C is REALLY pushing it, but if you dont go above 80, you should be fine. Use a tool to bump up your fan speed, and it wont happen. The highest my temp has ever gotten, while OCing is about 67 C…

  • Just saying...

    “the squares you see on the furry donut”
    WTF?! What’s with the furry, square sprinkled donut?!

  • You might also wanna see how to overclock a GPU with the help of MSI Afterburner, an enhanced version of Rivatuner.