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Does intel SGX work work on Z490 boards that display out using thunderbolt 3 or Displayport 1.4 ports?

Some Z490 boards have thunderbolt 3 and some have DP 1.4, but CPU's integrated GPU hasn't changed and it's limited to DP 1.2. Some people mentioned intel's thunderbolt 3 controller may use it's own GPU to achieve this? Does this mean SGX doesn't work when using a display with it. Same question for the DP 1.4 port? And lastly, can you have both integrated graphics and a video card enabled at the same time? I need a video card but I also occasionally need integrated graphics for SGX, and I don't want to reboot and go into the bios every time to switch. Thanks.

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