Noise, Overclocking, 2D Quality
Alas, our hopes for the cooling system to be really quiet didn’t come true. The card makes rather much noise even after the driver is loaded and the fan speed is reduced. Well, the noise is at a comfortable level when the card is in a closed system case, yet the card is far from being completely noiseless. And when you install two such cards into a SLI-compatible system, the noise doubles and becomes uncomfortable – you wouldn’t want to be near such a computer for long. The problem has a solution, though. You can restrain the cooler with the RivaTuner utility, but don’t slow the fan down too aggressively or the graphics card may overheat. Before starting with RivaTuner, make sure your system case is properly ventilated.
We received two samples of the ASUS Extreme N7800GT/2DHTV card and we checked them both at overclocking. The results were practically identical: the maximum stable GPU frequency on both cards was 460MHz. More exactly, it was 454MHz, since all GeForce 7 cards overclock with a discrete 27MHz step. We couldn’t reach the next frequency step (486MHz) due to the limitations of the cooling system and of the simplified power circuit of the GeForce 7800 GT. The memory frequency grew up to 600 (1200) MHz on one sample and to 590 (1180) MHz on the other sample of the Extreme N7800GT. This is a very good result considering that 2.0ns memory is supposed to work at 500 (1000) MHz. So, we recommend the reviewed card to overclockers – it shows good overclockability which may be even improved further by using a more advanced cooling system, for example a water-based one.
The 2D image quality was perfect with both samples of the card up to 1800x1440@75Hz display mode. We did not observe fuzziness or ghosting or any other undesirable effects.