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Amethyst1

macrumors G3
Oct 28, 2015
9,822
12,241
Does it matter what kind of DVI port?
Yes. It definitely has to be a dual-link DVI one.
But you think regular Display Port-to-mini Display Port cable should be able to work, with a monitor that is in otherwise good working order? Am I reading you right?
Correct.

was using a Dell 30” 2560x1600 and a Asus 27” 2560x1440 on my Mac Pro 5,1 with the 5770 GPU. I had to use two of these. One for each display. You can find a used one for less on eBay.
This is only necessary if the GPU only has DP and the monitor only has dual-link DVI. @OP - you don't need one of these!
 
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Amethyst1

macrumors G3
Oct 28, 2015
9,822
12,241
I wonder if the Apple version of that adapter is absolutely required for the monitor to work?
No. The Asus PA278QV monitor you linked to has both dual-link DVI and DP. So does your 5770. Either of these connections will technically do 2560x1440 just fine. No expensive adapter is necessary.
 

fastlanephil

macrumors 65816
Nov 17, 2007
1,289
274
I wonder if the Apple version of that adapter is absolutely required for the monitor to work? Their dongles always cost more, but also always work.

Apparently, the model numbers have changed slightly. Yours is no longer available, but they have the one I cited above instead. It is backordered, however. Something is going on here. I think they call it "Christmas" or something like that.
Yes! You have to use that specific Apple adapter with the 5770. A lot of people found that out a few years back. There are plenty of them on eBay although they are over priced as they use to sell for under $30 back when users were upgrading their graphic cards to run Mojave and no one was buying them then.

If you scroll down the eBay listings you see someone doing an auction for $7.99 but no takers. I’d offer them something like $20 and see if they bite. These adapters are pretty much obsolete except for the few who are still using a 5770, and very few users still are.

I’ve still have both of mine and I would just give you one if there was a way to ship it to you using a prepaid return padded envelope.
 

Amethyst1

macrumors G3
Oct 28, 2015
9,822
12,241
Yes! You have to use that specific Apple adapter with the 5770.
Can you explain why that is the case?

You only need that to go from a GPU that has DP to a monitor that has dual-link DVI. If both have either DP or DL-DVI, it is/should not be needed.
 
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1970mgbgt

macrumors regular
Original poster
Sep 15, 2015
114
9
I’ve still have both of mine and I would just give you one if there was a way to ship it to you using a prepaid return padded envelope.

Yes! You have to use that specific Apple adapter with the 5770. A lot of people found that out a few years back. There are plenty of them on eBay although they are over priced as they use to sell for under $30 back when users were upgrading their graphic cards to run Mojave and no one was buying them then.

If you scroll down the eBay listings you see someone doing an auction for $7.99 but no takers. I’d offer them something like $20 and see if they bite. These adapters are pretty much obsolete except for the few who are still using a 5770, and very few users still are.

I’ve still have both of mine and I would just give you one if there was a way to ship it to you using a prepaid return padded envelope.
Thanks for the offer. That's very kind.
 

1970mgbgt

macrumors regular
Original poster
Sep 15, 2015
114
9
No. The Asus PA278QV monitor you linked to has both dual-link DVI and DP. So does your 5770. Either of these connections will technically do 2560x1440 just fine. No expensive adapter is necessary.
Yes, specs are with those ports, but the monitor is backordered everywhere. I wonder if they are just Christmas-ed out or if the models are about to change again.
 

1970mgbgt

macrumors regular
Original poster
Sep 15, 2015
114
9
No. The Asus PA278QV monitor you linked to has both dual-link DVI and DP. So does your 5770. Either of these connections will technically do 2560x1440 just fine. No expensive adapter is necessary.
Do you think it would be worth it to try another copy of the Viewsonic I tried before, in hopes that another one might work, or is that just foolish? Could not make the first one work with the MacPro, but maybe I didn't know enough about cables at that point. I was just trying to use the included DP-to-mini DP cable, as previously discussed.

This one?


Got to say I'm kind of gun shy about doing it.
 
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Amethyst1

macrumors G3
Oct 28, 2015
9,822
12,241
Do you think it would be worth it to try another copy of the Viewsonic I tried before, in hopes that another one might work, or is that just foolish?
I'd probably try a monitor that also has dual-link DVI, to have another option in case DP fails to work again.

I was just trying to use the included DP-to-mini DP cable, as previously discussed.
If using that Viewsonic, the only way to hook it up to your Mac Pro and get full resolution is via DP... or this exact adapter that goes from the 5770's DVI to the Viewsonic's DP.


Apple's adapter will not work!
 

1970mgbgt

macrumors regular
Original poster
Sep 15, 2015
114
9

I'd probably try a monitor that also has dual-link DVI, to have another option in case DP fails to work again.


If using that Viewsonic, the only way to hook it up to your Mac Pro and get full resolution is via DP... or this exact adapter that goes from the 5770's DVI to the Viewsonic's DP.


Apple's adapter will not work!
I found one of the ASUS ProArt Display PA278QV Professional Monitor - 27-inch. It only comes with an HDMI cable and a USB cable. What cable should I order to best connect it? Do you think a dual-link DVI-to-dual-link DVI? Or would a MiniDP to MiniDP be better?
 

rusinu

macrumors newbie
May 11, 2015
3
1
I have had the same issue on acer XV272U + geforce 980Ti in mac pro.
Please try to set DP in your monitor menu as 1.2 or 1.1.
My default set was 1.4 and Mac Pro doesn't boot on it. After set to 1.2 works normal.
 
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1970mgbgt

macrumors regular
Original poster
Sep 15, 2015
114
9
I have had the same issue on acer XV272U + geforce 980Ti in mac pro.
Please try to set DP in your monitor menu as 1.2 or 1.1.
My default set was 1.4 and Mac Pro doesn't boot on it. After set to 1.2 works normal.
Thanks. I'll bear that in mind. This has been a bit of a stretch figuring this out.

Did you have to do that with the monitor hooked up to a different machine, or could you do it while plugged into your MP?
 

rusinu

macrumors newbie
May 11, 2015
3
1
Thanks. I'll bear that in mind. This has been a bit of a stretch figuring this out.

Did you have to do that with the monitor hooked up to a different machine, or could you do it while plugged into your MP?
I can go to the monitor menu when plugged into shutdown MP.
Ok, I've checked one more time monitor menu when there is no signal input and I can't go to the menu.
I have another computer over HDMI plug into monitor and thats the way why I can go to he menu.
You can try start MP with old monitor and plug DP from new monitor when system is loaded.
 
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Amethyst1

macrumors G3
Oct 28, 2015
9,822
12,241
Did you have to do that with the monitor hooked up to a different machine, or could you do it while plugged into your MP?
On my Dell monitor, I can only do it in the menu when something's being displayed. If the monitor fails to display anything because of the DP 1.2 setting, it's "press several keys in a specific order without any visual feedback" time.
 

1970mgbgt

macrumors regular
Original poster
Sep 15, 2015
114
9
I'd go for that one. Avoids possible DP issues.
Hi,

Thanks so much for your help with the monitor. I found an Asus ProArt 27" with DL-DVI and it's working great.

Can I ask another question about installing A SSD adapter card with a 2.5" drive on it in the PCIe slot that's supposed to have x16 lanes? The bottom two slots have that bandwidth. One houses the GPU, and I installed the adapter card (OWC here: https://eshop.macsales.com/item/OWC/SSDACL6G.S/) with a WD 2TB 2.5" drive on it in the other fast lane, but it's running just barely faster than the old platters.

Am I missing something here? I don't expect it to run as fast as an SSD blade, but the System Profiler is showing it as only running at x2. That doesn't seem right. Any ideas what I'm doing wrong?

Thanks again.
 
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