jdiamond wrote:
Note that this hack would only benefit the highest end late 2013 Macbook Pros - the ones with the the 750 - and I can't imagine there's a lot of volume on sales of that model. It may well be that NVIDIA simply declined to spend the effort needed to make a short-term Maverick MST hack solution for 4K@60Hz for such a small volume - and this might even be the reason Apple went with AMD/ATI GPUs on the Mac Pro - because they were willing to do the Hack.
I don't see any reason why your statements are not applicable to low-end late 2013 rMBPs, including the 13-inch ones using Iris. If, with the word "hack" you are referring to a firmware/driver update, then your statements are equally true for Intel's Iris and Iris Pro cards. Please see my question and NiqueXyZ's response on page 7 of this thread in this regard. In short he agrees that NVIDIA would not deplete its resources to release new drivers, as supported from NVIDIA's previous stance on GTX680. However he seems to be surprised as to why Intel does not release drivers for Iris and Iris Pro. In any case, he seems to agree with me that it is doable to release drivers for not only NVIDIA 750M, but also Iris Pro and even Iris.
I am now looking from another perspective, i.e. not doability, but whether if releasing any or some of these drivers would cause problems on the part of Apple. That is to say, if 4K at 60Hz is going to be output on late 2013 rMBPs running on Mavericks, then there are potential alternatives needed to be evaluated:
1) Both Intel and NVIDIA may release drivers, thereby making all late 2013 rMBPs outputting 4k @ 60Hz on Mavericks: best option for both Apple and its customers, would not cause any problems.
2) Only NVIDIA may release drivers: this alternative will make low-end 15-inch and 13-inch users having Intel Iris and Iris Pro cards make unhappy, but this option might be acceptalbe to some extent. Both Apple and its customers may think that only the customers paying for the best card can benefit from 4K @ 60 Hz on Mavericks. Nonetheless, Apple might not like this option.
3) Intel may release drivers for both Iris and Iris Pro, and NVIDIA may not release any drivers: This option would make high-end 15-inch users furious and, IMO, Apple would not allow this alternative.
4) NVIDIA may release drivers and Intel may release drivers for Iris Pro only: This alternative will upset 13-inch owners only. This alternative might be acceptable to some extent. Both Apple and its customers may think that only the customers paying for the mid-end and high-end cards can benefit from 4K @ 60 Hz on Mavericks. Nonetheless, Apple might not like this option.
5) NVIDIA may release drivers and Intel may release drivers for Iris only: Providing a feature for low- and high-end cards but not for mid-end card does not makes sense. This alternative would make low-end 15-inch owners furious and, IMO, Apple would not allow this alternative.
6) Intel may release drivers for Iris only, and NVIDIA may not release any drivers: Providing a feature for only low-end card and not for upper segment cards does not makes sense. This alternative would make all 15-inch owners furious and, IMO, Apple would not allow this alternative.
As seen, none of the options without NVIDIA releasing drivers are acceptable to Apple. Hence, if NVIDIA will not be allocatinf resources for releasing new drivers for Mavericks (as suggested by you and NiqueXyZ) then we will never see 4k @ 60 Hz output on Mavericks.