Just horrible customer service. One of the PCI-e slot on the unit that I received is clearly broken. What is worse is that when I contacted the seller, they just said "We know that our pc is working" and did not respond to me any more.  It's an unbelievably unprofessional attitude.I am sure that the problem is in this one PCI-e slot, since I tried the same exact sound card on multiple PCI-e slots, and it fails only in this specific slot.  It's not a compatibility between the OS and the card, since this card works on the other PCI-e slot of the exact same computer.  I have no idea how they can still insist that their is no problem on the PC.