I finally got this card to be recognised by my Asus Maximum IX Hero (Z270) after following the comments in this thread https://www.overclock.net/forum/6-in...1638843?page=1
The card is installed in my Asus Maximus IX Hero motherboard in the SB PCI Slot in the bottom PCIEX4_3 slot. I'm also using a 7700K that has 16 lanes if that matters.
My PCIE slots are configured as follows
PCIEX1_1 - USB3 Card
PCIEX16/8_1 - MS1 1080
PCEIEX1_2 - USB 3 Card
PCIEX8_2 - Empty. I tried the Thunderbolt EX3 in this slot using the NB PCI Slot option but the card hund the BIOS and I got a Q97 code and had to reset the BIOS.
PCIEX1_3 - Empty as its been disabled by the BIOS because if the PCIEX4_3 runs at X4 speed it disables this slot. Both slots can be active but the PCIEX4_3 will run at X2 speed.
PCIEX4_3 - Asus ThunderboltEX 3
The card shows up under the Thunderbolt software details tab and shows up under Device Manager as a System Device as 'Thunderbolt(TM) Controller - 1577'.
It doesn't populate the attached devices chain in the Thunderbolt software though.
The only problem is that it shows up as a hidden device with an error stating that is not connected to the computer.
When I use the Asus firmware adapter the card powers up and moves from a hidden state to an activate state in Device Manager > System Devices. The attached devices chain in the Thunderbolt software then updates with 'Thunderbolt Controller 1' with 'Port 1' and 'Port 2'.
Any ideas how to fix this?
It seems to be a power related issue as the card is recognised by Windows 10 x64 but doesn't power up to be able to be used.
I'm using the standard Asus software and drivers for this card and I've applied the Asus firmware update.