Hi, Recently bought a new system with z77 fatality professional (http://www.asrock.com/mb/Intel/Fatal1ty Z77 Professional/) It says : 2 x PCIe 3.0 x16 Slots I bought a gigabyte 280x - http://www.gigabyte.com/products/product-page.aspx?pid=4793#ov a Corsair 750 watts PSU. GPU-z keeps saying Thats under load playing games or running their render test in GPUz. It always says PCI-E x4 v3.0 I called my supplier and they are trying to claim everything is fine and not to worry - the thing is the motherboard has already died on me and I was meant to have received a new one (cant tell). I dont know if the previous one did @16 or not I wasnt checking things as much before. Should it be running @ 16?