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Again, you need to check Yosemite about, no performance impact on dpi independent desktop since the new renderer is optimal work to render at 216,300,400 dpi don't need to upscale then downscale.

About you and your retina mbp it's true, it can drive 5 million pixels, but the iMac it's supposed to be capable to drive 2 screens, at 4k are 16m pixels at 5k are 30+m pixels simple no single gpu setup it's capable to do that yet. Add this fact usually iMac 27 users do something more stressful than read email, surf the Web and watch p0rn...

I haven't used Yosemite. Are you saying that it no longer downscales when using a scaled resolution? With Mavericks if you use a 4k display and you want to have an effective resolution of 2560x1440 it renders a 5120x2880 desktop and scales it down to 4k. At least with Mavericks having a 4k display is not less work for the GPU than a 5k display would be.
 
I just checked and Yosemite works the same as Mavericks. It still renders a larger desktop and downscales to the native display resolution. So, nothing has changed, and I'm not sure what changes you're referring to.
 
I just checked and Yosemite works the same as Mavericks. It still renders a larger desktop and downscales to the native display resolution. So, nothing has changed, and I'm not sure what changes you're referring to.
On the other thread I answer in more detail, is not about resolution neither pixel doubling, objects rendered on an 4K 27" display on Yosemite will be natively rendered to the same size as on 3K display, instead use pixel doubling, drawing natively implies much better image quality, also if the resolution simple doubles the previous resolution, pixel doubling to 5K and then scaling to 4k maybe only required on older apps designed with static native resolution support.
 
Again, you need to check Yosemite about, no performance impact on dpi independent desktop since the new renderer is optimal work to render at 216,300,400 dpi don't need to upscale then downscale.

About you and your retina mbp it's true, it can drive 5 million pixels, but the iMac it's supposed to be capable to drive 2 screens, at 4k are 16m pixels at 5k are 30+m pixels simple no single gpu setup it's capable to do that yet. Add this fact usually iMac 27 users do something more stressful than read email, surf the Web and watch p0rn...

I have never seen any reference to that really high dpi renderer in Yosemite. I would be really interested in finding out more if true. Do you have a link for any information?

In my last post, I did say I think there might be a limit on the second screen if they do 5K (by the way, 2 5K screens would be 29.4912 megapixels, not 30+, which is why I said less than 15 for the main screen). I don't think they would have the capability for an external 5K as it would require Thunderbolt 3, which will be too late for a release this year.

As someone who only got a rMBP because a Retina iMac was not available, I would be happy for go without the option for a second screen if it meant I could have a retina version. I suspect many are the same (the many who are not will still have the option of a non-Retina for a few years yet).
 
I have never seen any reference to that really high dpi renderer in Yosemite. I would be really interested in finding out more if true. Do you have a link for any information?

In my last post, I did say I think there might be a limit on the second screen if they do 5K (by the way, 2 5K screens would be 29.4912 megapixels, not 30+, which is why I said less than 15 for the main screen). I don't think they would have the capability for an external 5K as it would require Thunderbolt 3, which will be too late for a release this year.

As someone who only got a rMBP because a Retina iMac was not available, I would be happy for go without the option for a second screen if it meant I could have a retina version. I suspect many are the same (the many who are not will still have the option of a non-Retina for a few years yet).
Not Yosemite, Xcode.

Don't worry you'll love the 4K retina iMac 27 or the 3K retina iMac 21, as I'll love to put a pair of these retina cinema display 4k on my Mac Pro.
 
Not Yosemite, Xcode.

Don't worry you'll love the 4K retina iMac 27 or the 3K retina iMac 21, as I'll love to put a pair of these retina cinema display 4k on my Mac Pro.

You said Yosemite, but anyway, can you please give a source for 216,300,400 dpi in Xcode?
 
Not Yosemite, Xcode.

Don't worry you'll love the 4K retina iMac 27 or the 3K retina iMac 21, as I'll love to put a pair of these retina cinema display 4k on my Mac Pro.

So you think the 27" retina iMac will "only" be 4K (unlike the 5K DELL monitor)?

If a 4K TB Display is announced, do you think the Iris Pro rMBP can run these new TB displays?
 
the starting price for an 27" retina iMac will be $2499 for 16 gb Ram, 970M and 1 T Fusion Drive

Its funny how you have all the answers, and still looking back at your posts pretty much all of them proved to be wrong - you obviously don't work at Apple :D But by all means, keep'em coming. ;)
 
On the other thread I answer in more detail, is not about resolution neither pixel doubling, objects rendered on an 4K 27" display on Yosemite will be natively rendered to the same size as on 3K display

I am not sure where you are getting this from.

OS X has supported resolution independence under the hood with arbitrary (non-integer) scale factors since 10.4 — this is nothing new. But there are various problems with non-integer scale factors, which is why every retina screen they've released has been rendered to with an integral scale factor (2x, or now 3x with the iPhone 6+), even if this means downsizing the output to fit physical pixels after the fact. If Apple had "solved" this issue, they would have used a non-integer scale factor on the 6+ for sure. But, in reality, it's not something that can really be solved — integer scale scale factors will always be easier to work with from a software point of view.

Yosemite does not appear to be any different from Mavericks in this regard; if you have any evidence that suggests the contrary please let us know.
 
I am not sure where you are getting this from.

OS X has supported resolution independence under the hood with arbitrary (non-integer) scale factors since 10.4 — this is nothing new. But there are various problems with non-integer scale factors, which is why every retina screen they've released has been rendered to with an integral scale factor (2x, or now 3x with the iPhone 6+), even if this means downsizing the output to fit physical pixels after the fact. If Apple had "solved" this issue, they would have used a non-integer scale factor on the 6+ for sure. But, in reality, it's not something that can really be solved — integer scale scale factors will always be easier to work with from a software point of view.

Yosemite does not appear to be any different from Mavericks in this regard; if you have any evidence that suggests the contrary please let us know.

Scaling maybe an issue if you just take an existing GUI and just as is deploys on another resolution, I'm very confident on the next iMac (as the Cinema display) to be 4K; Once you re-code the GUI targeting natively some resolution, NO SCALING IS NEED INDEED, so Id I'm Apple instead to go the Paramount Chalenge to early deploy 5K, instead I rewrite GUI on OS/X with native implementation for 4K, instead an scaled one, said that no argument here is valid as Mandatory to have 5K resolution on the iMac (which its ver very unlikely since requires 2 GPU and extesive unibody redsign, besides Prohibitively expensive for iMac tipical user).

Forget 5K until 2016.
 
Scaling maybe an issue if you just take an existing GUI and just as is deploys on another resolution, I'm very confident on the next iMac (as the Cinema display) to be 4K; Once you re-code the GUI targeting natively some resolution, NO SCALING IS NEED INDEED, so Id I'm Apple instead to go the Paramount Chalenge to early deploy 5K, instead I rewrite GUI on OS/X with native implementation for 4K, instead an scaled one, said that no argument here is valid as Mandatory to have 5K resolution on the iMac (which its ver very unlikely since requires 2 GPU and extesive unibody redsign, besides Prohibitively expensive for iMac tipical user).

Forget 5K until 2016.

There is rumor from trusted source saying there will be 5k in next two week, and nearly every rumor turned out to be true since the iPhone 5... Let's see...
 
Nvidia just release the 970M and 980M i hope Apple will be the first to adopt them on October 16th
 
Sure, as the Sapphire screens on the iPhone 6...

At least Apple did plan to do so :)

I understand your concern with the graphics, but 5k isn't that crazy. A 5k iMac will has 3.6x pixels as the 13" rMBP, is finding a discrete mobile graphic chips 3.6x as powerful as the Intel HD4000 really impossible?
 
At least Apple did plan to do so :)

I understand your concern with the graphics, but 5k isn't that crazy. A 5k iMac will has 3.6x pixels as the 13" rMBP, is finding a discrete mobile graphic chips 3.6x as powerful as the Intel HD4000 really impossible?
There is only a single source of the 5K iMac rumour, when the Sapphire screen was multiple sourced.

I don't want an 5K iMac as slow and useless as the rMBP 13, to drive properly an 5k panel you need 2 gpu, this double thermals, also there are the manufacturing issue, apple igzo panels are build integral with the external glass panel (not easy) , Dell 5k panel it's classic design, so an 5K iMac Will look thick as the previous generation.
 
There is only a single source of the 5K iMac rumour, when the Sapphire screen was multiple sourced.

I don't want an 5K iMac as slow and useless as the rMBP 13, to drive properly an 5k panel you need 2 gpu, this double thermals, also there are the manufacturing issue, apple igzo panels are build integral with the external glass panel (not easy) , Dell 5k panel it's classic design, so an 5K iMac Will look thick as the previous generation.

rMBP 13 has igpu...you can't compare HD4000 that had to run 1600p with an Geforce 970M that has to run 2160p for example
 
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