I have a Mac Pro 2.8 mid-2010/Nehalam with a Radeon HD 5770 video card in it (the stock video card for this model) and I’m trying to run two Dell 30-inch U3014 monitors with it.
This card should easily be able to run the two 30-inch monitors at 2560 X 1600. In fact, I had these two 30-inch monitors plugged into an old G5 with a much less capable video card and it ran them both at high resolution.
The Radeon 5770 card in the Mac Pro has 1 GB of video memory, and it is advertised as capable of running three 30-inch displays at a resolution of 2560 X 1600. So two should be no problem.
But only one of my two monitors can get that resolution. The other one shows a lesser 1920 X 1080 resolution.
The problem might be related to an adapter that I have plugged into one of the card’s ports. The Radeon 5770 has one DVI-D port and two Mini-Display ports. The cables I’m using from the monitors to the card are both DVI-D cables.
So to be able to plug in the second monitor, I put an Apple Mini-Display-port-to-DVI-D adapter into one of the card’s two Mini-Display ports, and that allows me to plug the second monitor ’s DVI-D cable into the Mini-Display port.
All the settings on both monitors are identical, but whichever of the two monitors I plug into the adapter is only capable of displaying 1920 X 1080. Yet either monitor will show 2560 X 1600 if I plug it into the card’s DVI-D port.
So, the problem is not the monitors, and it shouldn't be the video card--- it seems to be the adapter. Is it possible that the Mini-Display-to-DVI-D adapter is not allowing a monitor to show the higher resolution?
Can anyone tell me how I can run both monitors at 2560 X 1600 with this video card?
Any help would be much appreciated!
Tom
This card should easily be able to run the two 30-inch monitors at 2560 X 1600. In fact, I had these two 30-inch monitors plugged into an old G5 with a much less capable video card and it ran them both at high resolution.
The Radeon 5770 card in the Mac Pro has 1 GB of video memory, and it is advertised as capable of running three 30-inch displays at a resolution of 2560 X 1600. So two should be no problem.
But only one of my two monitors can get that resolution. The other one shows a lesser 1920 X 1080 resolution.
The problem might be related to an adapter that I have plugged into one of the card’s ports. The Radeon 5770 has one DVI-D port and two Mini-Display ports. The cables I’m using from the monitors to the card are both DVI-D cables.
So to be able to plug in the second monitor, I put an Apple Mini-Display-port-to-DVI-D adapter into one of the card’s two Mini-Display ports, and that allows me to plug the second monitor ’s DVI-D cable into the Mini-Display port.
All the settings on both monitors are identical, but whichever of the two monitors I plug into the adapter is only capable of displaying 1920 X 1080. Yet either monitor will show 2560 X 1600 if I plug it into the card’s DVI-D port.
So, the problem is not the monitors, and it shouldn't be the video card--- it seems to be the adapter. Is it possible that the Mini-Display-to-DVI-D adapter is not allowing a monitor to show the higher resolution?
Can anyone tell me how I can run both monitors at 2560 X 1600 with this video card?
Any help would be much appreciated!
Tom