Can 2008 Mac Pro run 4K or HD screens with the right video card?

Use Dual-Link DVI, but just make sure your cable is Dual-Link. You can't convert DVI to anything that will provide better resolution for a reasonable amount of money.

diagram courtesy of Wikipedia.

I just order one form Best Buy. The picture shows only 18 pin but the description and the reviews confirm it's a DVI-D that handles reolutions upto 1920x1200. So we will see. Will keep everyone updated.

DVI-D may omit most of the salmon-pink pins at the end which provide signals for a VGA interface.

18 pins and resolutions Up to 1920 wide are Single-Link DVI . That appears to be what you have already.

I thought you wanted Wider than 1920 wide, which requires Dual-link DVI which MUST have all 24 pins including the blue ones included.

It doesn't give me the option for 1900x1200 in the menu with the Samsung 40 inch hooked up. Here is a shot of what I have on my Display options screen. 1080 P and 1080i are my highest options. I have tried all the settings in the TV menu and can't get it back to anywhere close to 1900x1200. What is selected is what it is set on now. It's the closest I can get it.

Try [√] Best for Display and [√] 1080p (which is 1920 by 1080)

If that does not help you may need to come in the DVI port instead.

1920x1080 is how many dots you have. That's all you will get.

Chose 1080 and you are done

Why does that work now. It would not work at all yesterday. The screen was oversized and the icons were so pixelated. Oh well at least now I will have aback up cable if I need it.

One question:

If I connect 4K TV that does not have mini display port, but only HDMI 2.0 / 60Hz, then the Mac Pro 5.1 with HD7950 Mac Edition I must use a miniDP -> HDMI? It will then be wishful frequency 60Hz? Or only 30Hz? Do you know?
(sorry for my english, I'm begginer) ...

Thank you for your reply.

Michael

Do you mean mini Display port? HD7950 Mac Edition has 1x DVI, 1x HDMI, 2x mDP.

Do you know, what HDMI version HD7950 have? 1.4 @ 30Hz?

If you want to connect 4K TV at 60Hz, we have to reduce the use of minidisplay port to HDMI? What kind of cable you recommend?

Thank you for your reply and sorry for my english, I'm begginer.

Michael

So...

Running a non-mac msi Radeon R7950 on a Mac Pro 4,1 could I expect to be able to drive a 4K monitor over mini displayport?

The graphics card is said to be capable of DisplayPort version 1.2.

Currently, I use dual-link dvi to drive an LG W3000H at 2560x1600 which works much better than with the originally fitted graphics card(that was probvably outdated at the time of purchase).

Regards,

A

I use Dell UP2414Q with the card on my Mac Pro 4,1, and working fine 4k at 30Hz over mDP and HDMI.

However MST 60Hz is broken in ~10.9.4.

A framerate certainly becomes 60Hz by enabling DP 1.2, but the display shows two 1080p desktops side by side...

If anyone succeed to output 4k at 60Hz on old Mac Pro, please teach the method.

What graphics card is that?

It seems there is a problem with 60 Hz/MST, but maybe it remains to be seen if it's entirely a driver issue or also a monitor firmware issue?

Maybe it's at least encouraging that the card seems able to deliver two streams?

A

In my previous post, I wrote "display shows two 1080p desktops" by mistake.

I meant "display shows two 1920x2160 desktops."

Graphics card is MSI R7970.

In Windows 7 on BootCamp, R7970 and UP2414Q works fine with 60Hz/MST, so hardware have capability to transmit and receive two streams. (maybe R7950 too.)

It seems OS X's driver supports MST incompletely.

For the Mac "Sapphire" version of Radeon 7950, there is a driver for download(probably intended mostly for pre 10.8.3 systems). I wonder if that driver could work for a non-mac Radeon 7950 card, either out of the box or with some editing of system files?

A