Titan quest is NOT STALKER. Go into stalker with your X1650 and set everything to high. BAM 540mb of memory usage for video assets. On a side note, the X1900XT 256mb ran Titan Quest on all highest settings just fine, which leads me to conclude that Titan Quest doesn't use much in the way of video assets. Your tests will be biased and unfair, since you cannot grasp the concepts.