Here is your fixDid anybody try the 7990?
edit: I just tried the 7990, as soon as Chameleon comes up all text is garbled and hangs there. I guess that answers my question.
Hi RogueFive,Multiple monitor no problem, but I run mostly the 4K Samsung U28D590 which gets me to 3584x2240@60hz via DP. Unfortunately it's the wrong aspect ratio (16:10), but so far the best I can get under OS X. Under Windows I get full 3840x2160 @60hz just fine (with DP). Selecting 3840x2160 under OS X turns the last 10% on the right side of the screen into garbage.
R9 280X both Ghz edition mini display ports working at 60Hz on Samsung 4K monitor.
Hi RogueFive,
I have the exact same issue as bolded part above. I have the Samsung U28D590 running OS X 10.9 with a Gigabyte R9 280X 3GB GPU. I'm not sure I have an option for 3584x2240@60Hz via DP. I made a post here with an image attached of the issue - is this the same as you have, and, did you find a resolution for it?[/COLOR]
Hey there, just wanted to reply as I wasn't sure if you saw my post towards the bottom of my thread. It seems to be related to the pixel update frequency, I've not tested to find the precise border frequency as I wouldn't know what to do with that information, but I did notice when I press the monitor info button it tells me that the monitor is also not running at precisely 60Hz. I'll boot into OS X later on tonight and record the precise frequency, but as I change values in Switch Res X, it automatically sets the update frequency, so I can't seem to lock it to precisely 60Hz. Not sure if there is a solution beyond some change to the driver itself, at the moment I am running at 3200x1800x60Hz successfully though.Yes, your photo shows the same exact issue I am having. I haven't found a resolution ... I am simply hoping that a gfx driver update in a future OSX will fix this. I would have assumed something is wrong with the monitor, but everything is fine under Windows. Since you also have a Radeon and Nvidia guys have no issues with this monitor this would support a driver issue.
BTW, I noticed when set to 3840x2160 OSX is lying about the frequency. It says 60hz but when I press the Info button on the monitor the monitor itself says 56hz. That perfectly explains the garbage at the end of the HBL ... monitor is expecting the line to end earlier.
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The AMD driver in 10.10 solves this issue. Yay!Hey there, just wanted to reply as I wasn't sure if you saw my post towards the bottom of my thread. It seems to be related to the pixel update frequency, I've not tested to find the precise border frequency as I wouldn't know what to do with that information, but I did notice when I press the monitor info button it tells me that the monitor is also not running at precisely 60Hz. I'll boot into OS X later on tonight and record the precise frequency, but as I change values in Switch Res X, it automatically sets the update frequency, so I can't seem to lock it to precisely 60Hz. Not sure if there is a solution beyond some change to the driver itself, at the moment I am running at 3200x1800x60Hz successfully though.