While I cannot attest to the difference between the 7800gt and the gtx, I can attest to the performance of the 7800gtx alone. Before I had the gtx, I had the 6800Ultra AGP (and a crappier box) Ive noticed a huge difference in games. I can run virtually any game at 1280x1024 with settings maxed. Of course, there are exceptions where I cannot max out everything, namely, doom3. The whole point of what i'm saying is its all about your personal preference and how important it is to you for your box to a)run as smooth as possible with no slowdowns in the most greuling situation and b)be future proof to keep with the demands of games for the next couple years. I used to just upgrade bits and pieces as time demanded and found that this was just keeping me afloat. I always had to worry whether or not my box was gonna have an issue. Finally, I just threw out the money and built a box that is gonna last for awhile. Like i said, its all a personal preference. Is there much of a difference now between the gt and gtx? probably not worth $150 difference. Will there be much of a difference in a year or so when you do not have that extra quad of pipelines? Probably a little bit more yes.