With this card you can upgrade to USB (Universal Serial Bus) 3.0 via a PCI-slot. The old PCI-slot is not longer suffice for the full USB (Universal Serial Bus) 3.0 data transmission rate. For this reason, the card as inherent to not as fast as cards with PCI-Express slot. However, it is much faster than USB (Universal Serial Bus) 2.0 cards & thus to upgrade your older motherboards is very interesting.