It does not really matter where you put it, all you have to make sure is that the card is perfectly fitting in the PCI slot. Also, are you sure you want a WIFI card? I had one before, but I had to return it due to incompatibility issues. When I went to the store, one of the employees said that a USB WIFI adapter is much better because you can insert it into any USB slot on your computer to get better Internet connections. Where as in the card, it only stays in one place of the computer and is not necessarily the best place.