Wow! A socket 775 motherboard... It is getting close to having the same moniker I do... Ancient..
Your motherboard has a single PCIe 16x slot. So yes any video card out there will be supported. The info Biostar has online does not specify which version of PCIe the motherboard has, but I am fairly certain that it is PCIe 2.0, which is fine. All video cards are backwards compatible. They might run a percent or two slower than a 3.0 board, but that's negligible.