Getting a single faster video card would be better than 2 mid level cards simply cause you don't get a 2 fold boost with 2 video cards and games have to be specifically coded to make use of it. Often you will get a very minor benefit and some games you plain have to turn one of the cards off to get it to work
I bought a very nice motherboard and a mid-high level video card at the time. Only now am i starting to have to not run things at max settings so now I can add a duplicate card which because its been a while will be very cheap and extend the life of my current system a lot
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