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Discussion in 'Mac Accessories' started by rjheys, Apr 28, 2009.
That adapter only works with the laptops, which have analog support.
Analog signaling is not part of the DisplayPort standard, and is not included on your ATi 4870.
Not the physical connector, but the circuitry behind them, yes.
It should be noted that on Apple's store page for the mDP-VGA adapter, compatability is only listed as "Macbook, MacBook Pro, and Macbook Air".
Just buy a DVI-VGA adapter, online they cost only a few bucks.
That compatability note is not presented with the adapter when viewed as an option when customizing a Mac Pro order. This is what is listed on the Mac Pro order page:
I see no reason to think it would not work with a Mac Pro when it is specifically offered as an option when ordering one.
Did you install the firmware update?
Check thread here Apple Releases Mini DisplayPort to VGA Firmware Update 1.0