Anand has an interesting article on a video card mod that will supposidly improve display properties. This is not for the timid however!
"The problem with NVIDIA cards arises when a third party manufacturer's low-pass filter filters out some of the important frequencies as well as those that aren't needed. It is unlikely that the capacitors and inductors that make up the low-pass filter are deliberately chosen to be of poor quality, rather the rating of the components is not up to par with what NVIDIA's specifications call for. Another possibility is that when these third party manufacturers purchase the components for these filters some end up being of higher quality than others. This would explain the seemingly sporadic nature of what cards in particular have these image quality issues. Regardless of what the reason behind the low-pass filter causing these issues, there is a quick and dirty fix for the problem - remove the low-pass filter.
Note that by removing the low-pass filter you will be voiding your warranty on your card and we cannot be held responsible for any damage done to your card. With that out of the way, the process is actually very simple. On all NVIDIA cards since the GeForce2 GTS, the low-pass filter is readily identifiable by 3 sets of 3 capacitors connected in series with 2 sets of 3 inductors near the VGA output connector. Most board designs also offer a set of protection diodes as well although not all of these components will be found on all boards."