Your motherboard probably has a PCIe slot. Also PCI video cards are very old. I would like to share the specifications of a PCI video card. This PCI video card may not work even if you find it on your system.
3Dfx Voodoo 1
No 2D core, only additional 3D accelerator. 2MB frame buffer memory and 2MB (4MB on 6MB cards) texture memory. Max resolution up to 800x600 (6MB), or 640x480 on 4MB versions.
So these video cards are antique. It is very difficult to find. Already have expensive sale.