ok I'm having an issue I have never seen before with my newest GPU rig.
Do you have other multi-gpu rigs running on h270/z270 boards? Or is it your first one? There's quite a few settings in the BIOS that need to be set for multiple GPUs to work, but seeing how you said you've never had this issue before I assume you know about the standard BIOS stuff, done that before and it's all set correctly? Things like above 4g decoding etc?