I have a 1st gen dual 2ghz G5. It has 3gb of ram, 2 internal SATA drives and an aftermarket 9800 pro and 9200 vid cards each with a 17" LCD hooked up. I get tons of lag all of the time, more than I should be. Itunes does not even play smoothly while doing normal tasks. What could be the issue? My factory 9800 pro died and I made the mistake of putting one in that only had one DVI port and had to add the 9200 for the second monitor. Is this the reason since the 9200 does not use quartz extreme? Anything I can do about this? Anything else I can do to try and get things back to how they used to be speed wise?