Thanks for this reminding rakufmann87. Did not think that I should contact apple. I did after you suggestdas well as I sent email to Sapphire, Sonnet and AMD for help.
Sapphire Replied in their first and second emails reply as follow.
*** This is an automatically generated email, please do not reply ***
Dear Sir/Madam:
It is should be Apple Mac OS driver issue. We suggest you connect Apple support.
*** This is an automatically generated email, please do not reply ***
Dear Sir :
One more thing that after checking the spec of the Sonnet eGPU 750ex box , it only contains 750W PSU , but our card needs at least 850W and also they did not support our Toxic RX6900XT card (Please refer to page 8 of this pdf file -https://www.sonnettech.com/support/downloads/manuals/Compatibility_Graphics_Cards.pdf&source=gmail&ust=1622896756356000&usg=AFQjCNHn2tDK6RVRFjw4XrBKzZP523WQH A"> https://www.sonnettech.com/support/downloads/manuals/Compatibility_Graphics_Cards.pdf )
https://www.sapphiretech.com/en/consumer/toxic-radeon-rx-6900-xt-ee-16g-gddr6&source=gmail&ust=1622896756356000&usg=AFQjCNGfEjxbm9a7hgRUzOC-wsQKEpX2PA"> https://www.sapphiretech.com/en/consumer/toxic-radeon-rx-6900-xt-ee-16g-gddr6
So that this is a compatible issue between this external box and our toxic board , maybe not related to the driver.
Thanks.
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I know this is not 100% correct. As whoever replied me just saw the whole system requirement PSU W instead of the Toxic Card Power Consumption. The Toxic Card power consumption is just under <430 which is stated on their website. Something is not right with their answer.
Got replied from Sonnet as follow,
***
Thank you for the information. We are sorry to hear this is giving you trouble.
We have seen that updates to 11.4 may not fully realize the driver needed for the AMD6000 series, or cause a corruption which can cause similar symptoms.
If you are in an environment that allows for this, can you backup your data onto Time Machine, then erase your hard drive, then reinstall MacOS to the latest 11.4 version, then test again?
Let us know if any of this helps.
Thank you for your patience while we work through this.
============
So I just deleted my iMac partition and erased everything, and reinstalled a fresh copy of macOS Big Sur 11.4, but sadly it is the same. Sonnet 750ex is showing up in system information under Thunderbolt
It is just not working with the CARD.
Regarding Apple support, they requested me for 1 or 2 days to find out what is happening on their side with some senior engineers. Hope they will call me within 2 days.
It was my planned to buy Powercolour Card but the card is not cheap to buy in UK. So I contacted to Sonnet to seek some advice and confirmation. According to them it won't fit and it won't support. Then I contacted to Razer Core X to see whether I can use one of their one.
LOL ... their sales rep was worst. Told me none of the Razer Core X is support even 5700XT card because it is not in the list.
https://mysupport.razer.com/app/answers/detail/a_id/1727/session/L2F2LzEvdGltZS8xNjIyODE2NDU2L2dlbi8xNjIyODE2NDU2L3NpZC9mVWlwR3AlN0VHSWhsVmpLb2N6Nk85RTJqM3JLZFRXTFU2dHNhVjlLX3dldk40T1BXOVdlTFZUMjYxTU1kQU8xd3RWcGZqSll0UExlUEs3bHZYYyU3RXlWYjJZdHhHJTdFY2ZrNUtGNEY5RHJGQVlRYTNCWW1HdFRwYzJmZXclMjElMjE%3D
Had no choice but to buy Sonnet but need to find a card which will fit. Sapphire Toxic RX 6900 XT Extreme Edition fit properly inside Sonnet despite the radiator is hanging outside which is fine by me. I also bought Corsair RX850x PSU just in case Sonnet PSU is not enough. Now according to Sapphire I had to test with Corsair RM850x which is 850W and the result is SAME.
The card is still not showing up.
Just met a person on egup.io who is using Powercolur RX 6900XT card with Razer Core X on macOS Big Sur 11.4 flawlessly without any issue.
Could be one of the following reasons that is happening to me I guesse
1 ) Sonnet eGPU 750ex PCIe is somehow not working properly3
2) Sapphire Toxic RX 6900 XT Extreme Edition the one I bought is faulty.
3) macOS 11.4 have corrupt AMD driver.
4) Well my iMac 2020 has factory issue.
It is jut me and do not know why am I so unlucky 🙁
