How I got UHD (~4k) working on a MAC Mini

Started Mar 2, 2014 | Discussions thread
OP bronxbombers4 Veteran Member • Posts: 3,387
Re: How I got UHD (~4k) working on a MAC Mini

noirdesir wrote:

bronxbombers4 wrote:

Dell UP2414Q UHD monitor

OK, wow, actually got my MAC Mini to be able to support 3840x2160 or 1920x1080p HiDPI modes.

2. Go here and follow the to install the mac-pixel-clock patch to unlock higher pixel clocks.

Is that modifying the driver such that unlocks higher speeds, ie, patching binary mode or are these speeds somewhere in plain text?

It's modifying OS files, binary changes, not just text. It patches two system files. It simply removes the code that puts in a hard cap on how high the pixel clock can go for modes it exposes as driveable, I think. I think he is just essentially adding a goto or jump command to have the code jump over the section where Apple checks for such limits.

Apparently Apple did something in Mavericks to make the code not easily crackable now or something. Maybe it's possible though. I don't know too much about the innards of MACs. I have no idea why they would want to do that since usually companies like high adoption rates for new OS. Maybe they'd rather try to force people into buying new hardware (even though their old HW actually can do it!), yuck. I hate that sort of 'marketing' action. I'm just using my MAC as a development bed for tablet programming, nothing more, so I sure won't be paying for a whole new fancy MAC just for that (unless some app takes off and sells a zillion copies I guess) and I guess that means I won't ever upgrade to Mavericks, at least not any time soon.

So wow even a non-retina, little old Mac Mini can drive it just fine! It looks AWESOME! Well, so long as you didn't go to Mavericks! Hopefully they will hack Mavericks too. Or even better Apple will just unlock the port as well as make all of these options built-in and obvious and also get 60Hz drivers going too.

The 2013 Mac Pro can drive 4K at 60 Hz, the 2013 rMBPs can drive 4K at 30 Hz (and they have a one year newer Intel graphics than your Mac Mini, assuming it's a 2012 model). I think Apple just put a lid on GPU load to get a smoother graphics and possibly avoid overheating of the GPU inside a laptop.

Limiting to 30Hz doesn't deliver smoother graphics and the GPU could still be pushed to try to render more fps anyway though. The output buffer part of the graphics card would have to run twice as fast but usually that is a mild thing compared to what the main GPU does and I'd assume if the chip can drive 60Hz then it was designed to handle it just fine. Perhaps in some of them the chip can't drive 60Hz though?? From what I read it sounds like it probably can though, not sure.

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