Hey all,
Installed this motherboard earlier this year into an all-purpose machine I use for gaming, media viewing (home theater), video capture, and occasional CAD/office/writing work. Unfortunately the sheer use cases for this machine means that I have many combinations of displays and potential viewing setups, which requires the need for THREE dedicated GPUs. The primary work horse is an RTX 3080 Ti from Nvidia, while secondary cards include an old R9 380X from AMD for its analog output, and a low-profile Intel Arc A310. The CPU is a Ryzen 5800X, and I also have both M.2 slots occupied on the board for SSDs. The three GPUs have been working fine occupying all three physical x16 slots on the X570 Dark Hero (manual indicates this to be in an 8/8/4 configuration), but adding a PCIe capture card into the mix has broken some things. The capture card, an Elgato 4K60 Pro Mk.2, wants at least x4, meaning my remaining x1 slot can't supply enough bandwidth to make it happy (I tried anyway, but it was incredibly inconsistent in functionality), so I swapped it with the AC310 card. Now, the A310 card is losing functionality due to being confined to that x1 slot, and during some boots it isn't even recognized by Windows (11, 24H2) at all.
I have a broad mix of PCIe bifurcation cards, risers, slot size adapters, etc., so I should hopefully have something I can use to help get all these cards to work together physically, but I'm not sure if I have enough lanes, and I can't seem to find a way to bifurcate any of my x16 slots in BIOS - strange given that Asrock (the board I upgraded from) allowed this universally on all slots, and I assumed ASUS to be at least as premium, if not more. I'm thinking if I can split Slot 2 of the physical x16 slots into a 4/4/4/4 configuration, or more accurately a 4/4/0/0 setup since the presence of the other GPUs already forces the x16 1 and 2 slots into x8 and x8 only, I can keep the Nvidia card in Slot 1 (x8), the AMD card in Slot 3 (x4), and a bifurcation card for the Intel and Elgato cards in Slot 2 (x4/4). Does this make any sense? I see options for RAID bifurcation in BIOS, but none of the conventional options for things like 16/0, 8/8, 4/4/4/4 on other cards - ONLY RAID. Is there any way to do what I want with a modicum of system stability with the hardware I have, or would I likely need to do something drastic like upgrade the motherboard or give up on some usability for maybe the capture card or one of the GPUs? Thanks for your time, and feel free to ask any questions since my setup is stupidly complicated.
