The DDR2 on your motherboard refers to your system memory (RAM). The vram on your graphics card is completely separate, just make sure your motherboard has a x16 PCIE slot on it and that card will work fine.
Yes you can connect any PCIE graphics card, the ddr5 gddr5 etc is graphics memory on the graphics card itself, not your RAM, your mobo DD3 specification is only for RAM.