Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware: doesn't work with PCI 2.1 or less

I bought this card to put in an existing PC, but the PC has PCI version 2.1. I could not get it to work. The computer wouldn't even boot up when the card was in, and I tried this in two very different computers. Same thing happened. Finally, after much online research, I discovered that the computer must support PCI version 2.2 and above. Since I waited to install it, I cannot return it now so I'm stuck with an unusable card.