Question: I am using a GTX580, HD6990, or other video card with more than 2GB of dedicated video memory and GTA IV is treating my game as if my system were under spec by restricting my graphics options. What can I do?
Answer: We have heard some reports that certain video cards with more than 2GB of video memory may be causing GTA IV to believe the system is under specification even though the computer is powerful enough to run the game with higher settings.
We are in the process of looking into the issue and will update this page, if we can confirm the problem, as soon as we have more information about workarounds or a fix.