Hi, I have a 3,1 MacPro (2x 2.8 Ghz cpu, 32 GB memory, Ati Radeon hd 5770 1 GB Gpu Mac Version, Ssd SanDisk boot drive and 3 x Sata HD (each 3TB) connected to a 27 inch Apple Cinema Display running Mac OS X 10.11.6. I would like to upgrade to High Sierra without change my GPU or loose WiFi connection (there is an Airport card with Broadcom bcm4321) with the help of dosdude tools. Is it an easy operation? The system and the apps will be stable like under El Capitan? Is it a recommended update? Thanks in advance for every suggestions.