I just bought TL-WN781ND (WIFI card) I noticed it didn't work when my GTX 760 was installed on the x16 slot I moved my video card to the x4 slot and all of the sudden the WiFi card started working ! this is my BO manual http://download.gigabyte.asia/FileList/Manual/mb_manual_ga-p55a-ud3_v2.0_e.pdf I've tried reading but I didn't find anything about this Q1: can't I use my card on the x16 slot and make this WiFi card work ? Q2: is this a limitation due to my motherboard or what ? is there anything I need to pay attention to when buying a new motherboard ? because I'm going to buy ASUS PRIME Z370 for my new PC, will I face the same problem when trying to install a wifi card with the video card on x16 slot ????