MacPro 4.1 and 3840x2160/60hz VGA?

I apologize in advance for not speak very good English
Can you recommend a video card that can 4K is working MacPro 4.1 was enough for him and the OSX 10.8.5?
3840x2160 60hz resolution would be the target
Answers thank you!

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Thinkvision Pro2840m flickering at 3840x2160 60Hz

I have just installed a Pro2840m display on a brand-new Dell T5810 workstation (with AMD W5100 graphics card), and the Pro2840 display flickers really badly when setting to the resolution recommended by Windows (3840x2160 @ 60Hz).
The flicker goes away if I reduce the refresh rate to 30Hz.
The monitor is running microcode TN3.01. Windows drivers are up to date (AMD 14.301.1010), and system is running Windows 8.1, with 8GB memory
Any ideas?

Hello and welcome to the Lenovo community. Out of experience I would suggest you connect only the (or one) Pro2840m to your W5100 using the supplied DP cable (by Lenovo) to test whether the fault is with the Lenovo. Obviously don't forget to be running the latest ISV certified drivers published for the particular software you are planning to use found here.
As a side note: I wonder when was your display purchased, because microcode LN3.01 was the very first version these displays were shipped with in June 2014. The latest version which I have heard of for the Pro2840m was at LN3.07 which has addressed a list of serious issues (see here or here for examples). Sadly firmwares for these displays are not released to public, for upgrading your firmware you will have to contact Lenovo support and request an RMA.
Don't forget to post back your findings so we all can benefit.

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Can I use a mini display port to VGA adapter and then a VGA to av adapter to connect my MacBook pro to my standard definition tv?

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With extended desktop, it appears that I can only have one application presenting at a time. Sort of defeats the purpose of having multiple displays.
I am using the HDMI and the mini HDMI connectors.

I would like to have my MacPro laptop display and 2 external monitors (three displays). Question, how can I have more than one application displayed at a time? IE: I would like email on one monitor, Finder on my laptop, and iTunes on the other. Possible?
With extended desktop, it appears that I can only have one application presenting at a time. Sort of defeats the purpose of having multiple displays.
I am using the HDMI and the mini HDMI connectors.

I am considering a Apple iMac but would be interested in adding a second monitor. Does it have to be an Apple monitor or can i add any monitor with a thunderbolt cable and DVI or vGA adapter?

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I found that the Thunderbolt input accepts the mini-DVI (in my case converter to VGA for a tutorial use monitor)
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I have a Macbook Pro (late 2012) and I would like to connect it to 2 screens simultaneously (1 screen is a TV and can only take HDMI, the other is a larger computer screen and has both VGA and HDMI connections). How can I do this?

The article you cited refers to The Mac Pro, a 50lb silver tower -- not a notebook computer.
Everymac.com says:
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2nd Max. Resolution:
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Details:
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MacBook Air (Late 2008 or newer) model number 2,1 or higher
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MacPro 4.1 and 3840x2160/60hz VGA?

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