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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Out-of-the-box performance

Out-of-the-box performance

Before processors leave the factory they are being tested and speed binned by the manufacturer. The best chips are used for the high-end where high clock frequency's are mandatory in order to compete with other manufacturers. Chips of lower quality could be used in lower clocked products, manufacturers could decide to leave some of the high-end features away, they might lock parallel processors because of their low quality, etc. With the NVIDIA G86 processor you get a GPU designed for the low-end. Only NVIDIA 8400 and 8500 video cards use this processor, and the only difference between those two is that the latter has a wider memory bus, there is no other speed binning except of that being. In our previous article we saw how we could easily get quite some extra performance by overclocking the card manually, NVIDIA is having quite high yields with their G86 GPU's it seems. We downloaded newer drivers and repeated the tests from few months back, just to refresh your mind; here are our results for 3D Mark 2003:


Madshrimps (c)


We could overclock our card up to 675MHz core, 1674MHz shader and 500MHz memory clock. Different from our last article is that we could now overclock the GPU core and shader domain separately from each other, this leaves more work up to the overclocker but this also makes it possible to get even more performance out of the G86 gpu. In 3D Mark 2003 this translates into over 2000 points extra, that's more then 37% higher.


Madshrimps (c)


Crysis is not very enjoyable with this videocard, at the 1024x768 resolution we adjusted the game detail to low level and even then the 8400GS wasn't fast enough to keep average framerate over 25 frames per second. Overclocking does help quite a lot, with the higher clocks the minimum framerate increased by 57% and the average framerate by 43%. That's already an impressive increase in performance, but the game is still far from running smoothly at those utterly low resolutions, we really need more power here.

On to the voltage modifications ->
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