For anyone who is wondering, the ASRock Z390 Phantom Gaming-ITX/ac isn't compatible with the Black Ridge out of the box. I had to cut 3 fins off of the VRM heatsink and mount my Noctua A12x15 slightly off center to get the mounting holes to line up. Can't say I'd ever thought I'd take power tools to a motherboard before. The stock 92mm fan would have had the same issue if not worse since that fan is screwed in and can't be repositioned as easily. I ordered my Black Ridge from OCUK so I guess I'll have to wait to hear from them on the heatsink solder issue but for now I'll keep using it and try to tune my undervolt for a 9900k.