I thought of another nugget to chew on. IMHO, the factory overclocked cards are overrated. The % speed gain in the factory overclock is usually very minimal. They charge more for it than it's worth. Nearly all modern video cards come with software that will allow you to overclock the card in Windows very easily. Go for a card with more memory and overclock it yourself. I wish I had done that. I got my factory overclocked, 768mb card because it was on sale.
Regarding your inquiry about dual card configurations; you must have two cards of the same model for it to work. They are connected to each other via a cable, and you only use the outputs of one card. You can come close to doubling your video capacity that way. But, with the old card you have, you wouldn't be gaining much. A single, newer card will be much, much more powerful than two of the one you have now.
Regarding your inquiry about dual card configurations; you must have two cards of the same model for it to work. They are connected to each other via a cable, and you only use the outputs of one card. You can come close to doubling your video capacity that way. But, with the old card you have, you wouldn't be gaining much. A single, newer card will be much, much more powerful than two of the one you have now.