I have a computer that I built with a Gigabyte GA-78LMT-S2P mother board, AMD FX4100 CPU, Crucial Ballistix RAM and Crucial 128 GB SSD. The onboard video wouldn't allow the Sims 3 to work so I had to get a separate video card. I got a Visiontek Radeon 5500 card. But guess what? The Sims 3 doesn't see it at all. I have been trying for 3 weeks now to get it to work and nothing.
I have my eye on a Gigabyte Radeon 6450 video card which I will likely buy this coming Tuesday