Me and some friends of mine using the "Sapphire Ultimate R7 250". Looks like there is no chance to get it compatible with hackintosh. I'm running the Asus X99-E WS with 6-core Xeon E5-1650v3. Btw: Installation is possible with npci=0x2000 -v cpus=1 but not I can not enter hackintosh OSX after installation. Any hints or ideas? Btw: Thanks for this community here and thumbs up!