Will this work on a mid-2012 mac pro running sierra 10.12.6? i'm seeing conflicting answers...

Contrary to others, I bought this for my mid 2012 Mac Pro running high Sierra 10.13.X and it worked like a charm! Install was simple, no need to install drivers, simply plug n’ play!

Will this work on a Mac Pro mid 2010

It works perfectly , and is supported by the new Mojave OS that was just released if you choose to upgrade. Just make sure you get the right connecting cable ... 'DUAL MINI 6-pin to 8-pin adaptor'. Someone in one of the reviews for this card gave a link to an adaptor cable ( I bought it) , and it was the wrong type.

Is this the card that apple recommends for a promac to run mojave? does it come with a cable?

As I understand it, originally Apple was using an RX580 specially prepared from AMD and then they switched to this one from Sapphire and it is one of the recommended cards. Apparently the Radeon Pulse works well and the Radeon Nitro does not work as well or is harder to configure. I just plugged this one in connected the monitor cable and presto-zingo it work at full 4k res. and the proper memory amount. No it does not come with a cable. I've never had any video card/GPU card come with a cable. Cables usually come with a monitor. My LG monitor came with several video cables.

since my macbookpro is -macbook pro(retina, 15-inch, mid 2014-highsierra-intel irispro1536mb, will it work in sonnet550w box?

That's a great question. I also have a MacBook pro, and wanted to be able to use this card in it some times... I searched for a week, and could find nothing, nor could I get a response from any of the Mfgrs of external PCI enclosures.... This is a great card, and it's NATIVELY supported under high sierra... in fact, its the same chipset that comes in the iMac 5k's.... I dropped this into my mac-pro, and other than seeing the boot screen (which requires EFI flash), it works perfectly. you can have this card flassed at macvidcards.com... they are great. In short, I hunted for the info that would answer your question before I bought my card, and was unable to find anyone who could tell me definitively. Regards! and Good luck!

Max Screen Resolution	3840x2160
RAM	8 GB
Memory Speed	1750 MHz
Graphics Coprocessor	AMD Radeon RX 580
Chipset Brand	AMD
Card Description	AMD Radeon RX 580 with 8 GB GDDR5 memory, 2304 stream processors, 8000 MHz effective memory clock, and Dual-X Cooling technology, compatible with PCI-Express 3.0 and consuming less than 225 watts of power.
Graphics Card Ram Size	8 GB
Brand	Sapphire
Series	Sapphire 11265-05-20G Radeon PULSE RX 580 8GB
Item model number	11265-05-20G
Item Weight	0.176 ounces
Product Dimensions	11.25 x 3.5 x 6.5 inches
Item Dimensions LxWxH	11.25 x 3.5 x 6.5 inches
Manufacturer	Althon Micro Inc.
ASIN	B06ZZ6FMF8
Is Discontinued By Manufacturer	No
Date First Available	April 18, 2017

SAPPHIRE Radeon 11265-05-20G Pulse RX 580 8GB GDDR5 Dual HDMI/ DVI-D/ Dual DP OC with Backplate (UEFI) PCI-E Graphics Card Graphic Cards

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