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Retina like screen

Apple marketing at it's best. :D

Those 'retina' screens are just usual 4K/5K displays which work on every computer, presuming your GPU can drive them. I think support for 4K@60Hz@SST started with Nvidia GTX 6xx generation and AMD HD 7xxx (mid- to highend models).
 
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sparkie1984 said:
Ah I thought it scaled the screen a certain way to achieve the high density rather than running the screen at its native resolution?

Or am I being an idiot?
Click to expand...

I have a 4k client preview TV. By holding option when clicking "scaled" I can see all the HiDPI (retina) modes. I must say the clarity even on a TV is incredible.
 

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No, you're correct. But that scaling ability is built into OS X. Here's the Displays system preferences that I see with a Dell P2715Q 4K display:

Screen Shot 2015-10-23 at 8.44.34 AM.png
 
10.11.1 bring that HiDPI option back for my 7950 + 4k TV setup. It was there since 10.9.x and was taken out by Apple, and now it's back.
 
sparkie1984 said:
So a 4K display would be able to achieve a retina image?
Click to expand...

It depends on the size of the display and the number of pixels. Ideally a 4K 24" display or a 5K 27" display if you want it to be very similar to what Apple does, but any 4K display will get you close to retina.
 
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I use the LG 31MU97. With switch res x I can do HIDPI at 2048 x 1080 or 2560 x 1350. Just looks incredible.
 
on samsung 28ud590 with 3840x2160 screen.

2560 hidpi mode looks the best from available modes list, looks almost like 27 inch 5k, 44 percent of pixels getting lost (downscaling from 5k to 4k) but it's not noticable and looks great.
 
sparkie1984 said:
What gpu are you guys using to power them?

I only have a stock gpu at the moment with 512mb of ram so I know that'll need upgrading
Click to expand...

Yeah I don't think that GPU will do it.

GTX 680s are a good choice, they can be flashed to work as a true Mac graphics card, are relatively powerful even today and can do 4K.
There's two versions, a 2gb and a 4gb, there's ROMs available for both so if you can I'd spring for the 4gb one.
 
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I've played quite a bit with the iMac 5K in the local Apple store, and decided I wanted a display that good for my cMP 2010. The iMac 5K display is amazing.

I purchased a flashed 7970 from MVC, and replaced the stock HD 5770 graphics card.

[I have no interest in fiddling with Nvidia drivers for Mac OS. The HD 7970 was more than enough for my goal, which is simply 4K UHD on a decent monitor with the 2010 cMP. I ran the new 7970 with my old (non 4K) monitor for a few weeks, never a glitch, everything ran completely normal]

Anyway, I paired the 7970 with a Dell P2715Q 4K display, and am blown away by the display quality. It is the equivalent of nearly any Apple Retina display - the pixels are not visible with your naked eye. I get the full resolution at 60Hz using a mini-displayport to displayport cable.

Not all is peaches and cream though. With the 7970 card flashed from MVC, and Dell P2715Q pair: (Yosemite 10.10.5, 6 core 3.33Ghz classic MP 2010, 24G)

1) As far as I can tell, you will never, ever see a boot screen with the Dell 4K monitor attached. If you have a "normal" monitor attached (2560x1600 or less), you will see a boot screen, the Apple logo, etc. This is what a "flashed" card gets you - the boot screen with a normal monitor.

2) To power up or restart the cMP with 4K monitor attached, the monitor must be initially off. When you hear the startup chime, then turn the monitor on. Everything is fine after that, the 4K display comes up, etc.

3) If you restart the cMP, or power up the cMP, with the Dell 4K powered up, all you get is the start up chime every second or two forever. The Dell 4K must be off when the cMP is restarted or powered up. Otherwise, it just sits there, chiming away every second or two...

4) Sleep works fine. If the display sleeps, hit a key and everything is fine. If the cMP is asleep, hit a key, the cMP fully powers up, and everything is fine.

I didn't test anything with two monitors attached (like the Dell 4K and a normal monitor...) Your mileage will vary with display, display card, etc.

It's worth the hassle though. The Dell P2715Q display on the cMP is amazing. The 7970 might even be able to drive two of them..
 
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Thanks for that really informative reply!

How disappointing that you have to have the display off when starting from cold. However I could sleep it and live with it like that.

I will look into a flashed card the only downside is the import fee and shipping costs from MVC, not his fault may I add!!

Shame there's no uk distributer
 
leadfeet said:
2) To power up or restart the cMP with 4K monitor attached, the monitor must be initially off. When you hear the startup chime, then turn the monitor on. Everything is fine after that, the 4K display comes up, etc.

3) If you restart the cMP, or power up the cMP, with the Dell 4K powered up, all you get is the start up chime every second or two forever. The Dell 4K must be off when the cMP is restarted or powered up. Otherwise, it just sits there, chiming away every second or two...
Click to expand...

Neither of these is true for me, using an unflashed GTX 970 and Dell P2715Q. The Mac Pro boots just fine with the display turned on.
 
sparkie1984 said:
What gpu are you guys using to power them?

I only have a stock gpu at the moment with 512mb of ram so I know that'll need upgrading
Click to expand...

I'm currently using a GTX 980 with my Dell P2515Q, but I have to agree with Lucas Godfrey. From a compatibility point of view, the GTX 680 is easy to flash and works well.

However, keep in mind that if you use a GTX 680 with 4K or higher, you will only get a boot screen when using HDMI. It doesn't give a boot screen when using DisplayPort or mini DisplayPort.
 
Will future OS X updates stop the cards working?

I'm wondering whether to just get a card and plug it in? I don't use boot camp and could always keep the old GT120 to use in case of emergency? Or is it not that simple?

Basically I'm after the least maintainence solution as I don't really understand the whole flashing malarkey
 
sparkie1984 said:
Will future OS X updates stop the cards working?

I'm wondering whether to just get a card and plug it in? I don't use boot camp and could always keep the old GT120 to use in case of emergency? Or is it not that simple?

Basically I'm after the least maintainence solution as I don't really understand the whole flashing malarkey
Click to expand...

No one other than Apple themselves can guarantee which cards will continue to work and which they will drop support for. That being said, since a Kepler video card appeared in some of their products, it can be fairly safe to assume that the GTX 680 will continue to work for the the foreseeable future.

Read the sticky on top of this forum about using Nvidia cards. In essence, you can just buy an off the shelf GTX 680 and plug it in and it will work. All you'll lose is boot screen.
 
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For a 4K screen it's actually better to leave the card unflashed, this will avoid issues mentioned above (boot loop/freeze in early boot stage).
From what I know only MVC Maxwell cards can reliably show 4K boot screen. Some AMD cards flashed with the stock 7950 EFI will also do this but it seems to depend on the card and/or attached display.
 
Really appreciate everyone's help here (and patience)

Do any of the newer amd cards "just work"? It's hard to find the older cards and the gtx 680 is expensive!

I won't be gaming etc, just want a retina effect screen
 
sparkie1984 said:
Really appreciate everyone's help here (and patience)

Do any of the newer amd cards "just work"? It's hard to find the older cards and the gtx 680 is expensive!

I won't be gaming etc, just want a retina effect screen
Click to expand...

A GTX 650, 650Ti or a 660 will also do fine with 4K if you aren't gaming but VRAM is key so you'll need a card with at least 2GB of RAM, 4 is ideal but as far as I know there aren't any cards below the 680 which pack 4GB of RAM but one 4K display will be fine on 2GB of Ram.

As long as you're running one display only something like this would be fine http://www.ebay.co.uk/itm/Zotac-GeF...973163?hash=item3ab4b6aa2b:g:ZbcAAOSw5VFWK7JU
 
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sparkie1984 said:
Thanks for that I'll have a look at the link later
Click to expand...
No problem. Sad thing is, 99% of the online advice for 4K is driven by either gamers or performance chasers and can therefore be ignored.

4K doesn't really take a great deal of power to get working in none GPU intensive apps, it only becomes an issue if you're running multiple monitors and taxing the VRAM with gaming or CUDA processing etc.

That said, be wary of buying the bare minimum just to get a 4K setup, just in case in future your requirements change (e.g. you start using your MP for high end work) in which case you'll only ended up paying twice.
 
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