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The nVidia GPU numbers do mean something, but it takes a bit of work to track it down. I was temporarily confused between the 960 and 690 and almost warned you off.

When I bought my system, I went for two 680's (state of the art at the time) to do surround on three monitors, and the 690 was an alternative to that, except that it wouldn't be as fast. The x9x numbers are effectively twin cards, with SLI built-in, and use only a single PCIe slot. The x6x, x7x, x8x are single-GPU and can be used in SLI only if the motherboard has twin slots and supports it. Two slots allows twice the transfer rate to the cards, so the result can be faster framerates, where that's the limiting factor.

nVidia produce the GPU (chip) and multiple manufacturers put them onto video cards, so there can be quite a bit of difference between them. The amount of VRAM, and the quality of the cooling can make the price vary a lot. A cheap card may not last long, if they skimped on the cooling. The one you picked looks good in that respect, as a single card. I'm not sure how well a pair for SLI would work, as one card might block the fans on the other. Mine share the liquid cooling for the whole rig, so it's not an issue. If you don't intend adding a second card, that's not a problem for you, either.