I currently have a Asus ROG Rampage IV Extreme board, and have three GPUs in it. I have 2x 580s in SLI driving my main 30" screen and a little GT430 driving my secondary screen. The board allows me to have the 2x 580s running in 16X full PCI-E bandwidth, and the second screens card (GT430) running at 8x.. The configuration is like below... (I love UEFI BIOS screenshot facility) What I would like to do is add a 1x PCI device.. specifically a soundcard to the x1 PCI-E slot, and according to the PCI-E simulator in my BIOS that will still allow my 16x-8x-16x GPU configuration.. like this... However.... I can't get to my x1 slot because it's obscured by my top GTX580... so I thought.. no issue.. I'll stick it in the bottom 8x slot, but the simulator then shows this... My question is... does the simulator show this because it assumed I'm sticking a GPU in there? You can't specify in the simulator.. you set either occupied, or not occupied. If I was to stick a 1x card in this bottom 8x slot would it cause the GPUs to still be 16x-8x-8x like above, or will only being a 1x card still allow 16x-8x-16x? Does it have to be specifically the 1x slot?