USB card: PCI vs. PCI E

I've tried 2 audio interface boxes for use with recording analog signals and neither have worked plugged directly into my usb ports on my motherboard. I am toying with the idea of getting a USB card, hoping it will be faster / have more bandwidth. Is there a difference in performance on USB interface cards between PCI vs. PCIE? The specs look the same to me.

Hi K

The PCIe has better bandwidth. Since PCI Express is a serial based technology, data can be sent over the bus in two directions at once. Normal PCI is Parallel, and as such all data goes in one direction. PCI Express bandwidth is not shared the same way as in PCI, so there is less congestion on the bus.