Mainly the ones that don't have 2.0 on their motherboards but uses the PCI port for it. I am looking to buy a USB 2.0 PCI card, but haven't a clue to what is good or not. I know there are some chipsets that work better than others...and again I do not know what they are. If you have one of these..please help me out by listing the Brand / Model...Operating System...and your review on the card. Thanks.