In the interests of thread environmentalism I have searched around for an answer to this but haven't managed. Feel free to direct me to a good link with the information I need. I'd like to know about dual cards. I currently have a single Geforce 7900 GT/GTO (does anyone know whether the 'GT/GTO' is significant or what it stands for btw?) 256mb card. I remember when I bought the PC I was told I could upgrade to dual cards at any time - so I guess there is an extra port (apologies if my thinking or terminology is incorrect, I'm keen to learn, so please correct me ). Does the second card have to be identical (or is it advisable), or does it just have to have the same amount of memory (I seem to remember this is a good idea with cards (?) of RAM)? I assumed a 7900 nowadays would be dirt cheap, but this is the cheapest I've found so far at £70 (assuming its the same one, I find it a little difficult to tell ) but admittedly I'm not sure where to look so perhaps you could advise me on that score (I live in the UK) too. Finally what can I expect in terms of graphics improvement? I assume it would be more than a simple increase in RAM. I.e. to what extent is it worth making this upgrade? Many many thanks!