With a dual core I expect the rig will not be able to make use of the latest gpu cards, I mean the CPU probably means bottlenecks that put a foot on the GPU's speed. That means you can save money there and must not go for the newest, the latest, the most expensive. Go back to generations for a start.
You do not need to install separate software to learn about the components of your rig, Windows offers such options. It's just that I use that once every two years and thus forget where it is hidden, some kind of system diagnosis tool it was. Somebody else has to give the details. O run the speed indexing service opf Windows.
I could imagine that - assuming the PSU supports that - you end up with something in the range of a GTX460, not higher, I doubt that a dual core can make use of the potential of the 500- or even 600-series. Sometimes I saw 460s in their 1 GB incarnations in very good bang-for the buck deals. I use it myself, a very good choice it was. An extremely good choice.
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