Half-Life 2 does benefit in a certain way from the 256MB of GDDR3 graphics memory by ASUS Extreme N6600GT Silencer. Although you can really feel the benefit of having so much memory only in high resolutions when full-screen anti-aliasing and anisotropic filtering are enabled. As for the results of the overclocked card I can say that it boosts the gaming performance of our hero up to the level of 12-pipeline solutions.
We can see practically the same things in d3_c17_02 demo, however, here ASUS Extreme N6600GT Silencer is a little bit behind GeForce 6600 GT in pure speed mode and in 1024x768 resolution. The performance difference is hardly noticeable, and can be regarded as a measuring error or as a result of different memory timings. In all test modes the ASUS Extreme N6600GT Silencer working at its nominal frequencies is as fast as RADEON X700 PRO or slightly faster, and the overclocked Silencer is almost as fast as RADEON X800 GT.