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Firmware is actually a BIOS

This utility can only make your 4,1 become 5,1, but you are not with the latest firmware yet until you run the High Sierra installer.

Firmware is actually a BIOS

It worked after clean installation of Mavericks BIOS updated!

Congratulation! Now you can run the High Sierra GM installer to update to the latest firmware (you can run it just for the firmware, once firmware update completed, you can abort the actual MacOS installation).

Taken from some forums:

"Just finished some extended chat with the Nvidia support hotline  :cry:

Apparently, the 10.12 Nvidia Pascal Web Driver disaster will find its continuation under 10.13 High Sierra  :wallbash:

The answer was quite clear. There is an ongoing dispute between Apple and Nvidia concerning contracts, rights and marketing policies... Currently he was not able to say if there will be 10.13 macOS High Sierra web driver support at all. But for sure it seems that there will not be any 10.13 Web Driver support in the near future!  :thumbsdown_anim:

Very deceiving news   :help:

Ironically, the 10.12.6 Web Driver workaround just supports OpenGL and Metal for Kepler graphics cards. Pascal and likely also Maxwell users have to live with proper screen resolution and basic video acceleration"

As with other Graphic APIs, some hardware will support it completely, some partially(hardware+software)  and some won't support it at all. Any hardware that supported metal 1 will probably at least partially support metal 2. Newer GPUS such as AMD RX cards, should fully support it.
My guess is that the GTX 980 will only have partial support.

Hi all,

Is there any info as to which GPUs support Metal 2? Is GTX 980 one of them?

Thanks for your time.

Nice find. If this is true that would make another bump in sales of flashed NVIDIA cards this time for just Mac Pro 3,1 users

It worked after clean installation of Mavericks BIOS updated!

That's the one I already got. Maybe I will try to do what you've recommended.

^^^^That is NOT the latest firmware for a 5,1 cMP.  AFAIK, the latest FW is only available and is included with the Current Beta High Sierra download.

Lou