Increasing the chip clock has definitely got a higher impact on 3D performance than increasing the memory clock. Not every chip has the same ability to run at the same high speeds. However, a chip that is cooled as badly as in case of the STB Velocity 4400, will hardly ever be able to reach high clock speeds. The same is valid for the memory. Some memory chips can cope with up to 125 MHz, others can't.
Memory chips are a bit more consistent though.
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