Got this board (https://www.asrock.com/MB/Intel/Fatal1ty%20B250%20Gaming%20K4/index.asp) and can't get 6 GPUs to work on this. Will pay 20$ in Dogecoins for anyone that runs me through BIOS, resulting in a working 6 GPU rig.
With 5 GPUs the board runs fine, with 6 the usual BIOS Screen changes to a more legacy-style screen and nothing happens (just the cursor blinking in top left corner after a couple minutes waiting). I saw thread/blogs where people do run 6 GPUs with this board.
Disclaimer: please no one that wants me to teach about PCI-E Gens, TOLUD (and what not) because they smell easy money. Tried every combination of 3.5G (don't have 4G) TOLUD and PCI-E Gens. Please contact ONLY if you DO have actually this particular Mainboard. Thanks.