I was pretty sure from what I've read I was ok but good to know. I've ordered the parts and picking them up soon to do the build, I'm putting it in a Raven RV04 case as the plastic crate through better for airflow isn't really an option in the server room but the RV04 should flow well enough with only 2x GPU's in the case, I will look at adding a 3rd GPU later once I'm happy everything is working as required and will obviously need a riser to space them out then but with only 2x GPU's to start can I just run them off the mobo?