yumichan is certainly arrogant and he is not the least but helpful if you have a real problem like this: I got a Dell U2413 wide gamut at an impossibly low price, and was influenced by the Dell (Photography Life) forum and tft to go ahead and get the i1Display Pro, also at a decent discount, so that I could calibrate the internal LUT. But then I got out my abacus and figured out that using the Mac 8 bit output driving an 8 bit +FRC monitor to put values into a 14 bit LUT doesn't make a whole lot of sense. Then I discovered that read me of the DCCS says that "some Macs will crash and the only way to recover is to hook up a new monitor to reboot and then reconnect the U2413" I already knew that contacting Dell support to find out WHICH Macs is hopeless, since I have never spoken to a Dell tech who even knew that Dell makes monitors or that Macs can drive them. Frankly, I don't believe that Dell does make monitors, I think they're third party and rebranded. So I turned to Bruce Wright at X-Rite who has been helpful to me and in that forum. He referred the matter to the X-Rite Dell liaison guy for clarification, but Dell has never felt they have some splainin to do. I said , screw it, set the monitor to factory aRGB, which is low delta E if you believe the cal sheet, and packed away the i1Display Pro for use when Apple goes 10 bit (never, they don't care) and/or I get a 4k.