what's the best track size for PCI card and 256 pin QFP chip?

Question

I tried to develope PCB on altium, what's the best track size for PCI card edge and 256 pin QFP chip ? Thanks

Answer 1

The correct trace width depends on what trace impedance you want and your PCB stackup. There is no way that we can tell you a useful number. But you can Google "microstrip impedance calculator" and calculate it for yourself.