Hi Nenad
1. yes, for example i.MX_6Dual6Quad_Sabre-SD_Linux_Release_Notes.pdf
L3.0.35_4.1.0_LINUX_DOCS
states that was tested Intel gigabit CT network standard PCIE GEN1 X1 card.
2. I am not aware of tested 3G modules. In general any standard PCIe module will work
for example below
GTM671W/GTM679W | Option
3. You can not attach two different modules to one slot, as for WiFi
i.MX_6Dual6Quad_Sabre-SD_Linux_Release_Notes.pdf
states that was tested
iwl5100/6300 WiFi mini-PCIE GEN1 X1 cards.
Best regards
chip
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