Is that the cedar? Yes it will work for you, its a low profile card. Its made to use nearly no power but still play games. Just do not expect maxed settings on everything.
PCIe 2.0 cards are also generally backward compatible with PCIe 1.x motherboards, using the available bandwidth of PCI Express 1.1. Overall, graphic cards or motherboards designed for v 2.0 will be able to work with the other being v 1.1 or v 1.0.