NVIDIA Geforce 8400GS Overclocking Guide

Howto by geoffrey @ 2008-03-12

Few months back we had a peak at the GeForce 8400GS and we saw how performance wise this card is not that bad of a choice considering its price. Even with that narrow 64-bit bus we could greatly improve the performance of our test samples, but we do feel that there is quite some left in those cards, could we double our framerates with more volts supplied?
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Overclocking with extra volts

Overclocking with extra volts

We bumped the standard GPU voltage of 1,29V up to 1,4V while the VGA memory voltage is being increased from 1,99V up to 2,1V. By doing this, we could increase the clocks up to 742/1782/540.

The card is really clocked to the edge of stability now and with the standard cooler you should pay attention for high GPU temperatures. The normal 8400GS heatsink is nothing more then an aluminum plate with a fan mounted on it, expect temperatures in a range of up to 90°C:

Madshrimps (c)


This is holding us somehow from getting higher clocks stable on this videocard. For now, have a look at our performance chart of 3D Mark 2003:

Madshrimps (c)


The extra clocks gave us another 700 points in 3D Mark, not that much considering the increase in clock speed. Here is Crysis:

Madshrimps (c)


You will hardly notice a difference here, performance grew 10% more but in frames per second there is hardly anything gained. With the stock heatsink many will not find it very useful to do the voltage modifications, and to spend 30€ on heatsink for a video card which hardly costs more then that looks a bit silly. But the handy people among us might still have something around to improve cooling ability's on their video card, you could easily improve GPU core temperature by attaching an old Pentium 2/3 heatsink. For myself, I used the Zalman VF-1000 LED. This heatsink is an excellent tool for the modders, it comes with high compatibility and may always come in handy for stuff like this. Onto next page where we used better cooling and even more volts to get more performance out of our video card ->
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