Analog card, fxs without power supply

Hi all.
I have a hp computer, and I am learning about asterisk , freepbx. Now I want to configure an analog card to connect to pstn but my computer only have 1 pci express slot. and my computer doest have power supply to connect a tdm/aex card with fxs module.

Does anyone know any PCIE card that doesnt need connect the power supply from main board?

I am not sure about atcom, but I read about some clone cards doesnt need the power supply. And this have to ve PCI express.

And even, my computer is narrow and a 4 ports cards maybe doesnt fix inside the box, but I dont think there are 2 ports cards nowdays. But I can remove one side of computer.