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@eGPUfan: The script for OS X is not in any way written by the BizonBox guy(s). It's written by goalque from this forum -> http://forum.techinferno.com/mac-os-x-discussion/10289-script-automating-installation-egpu-os-x-inc-display-output-new-post.html At least he hasn't removed the legal stuff about the license... Anyway, if you're interested in the newest version, have a look at the link.

That's normal and I see the same message before I flash my card. Someone else may be able to tell you exactly what the PCI subsystem ID is or why it doesn't matter that there is a mismatch. Then again, the explanation might not be quick

Version 0.9.4 is ready. This is so far the biggest update and the script has grown to almost 1000 lines. - Native AMD support, masks for any card if codename is found - Possible to use Nvidia official driver for Kepler cards [-skipdriver] - Detects Thunderbolt connection - Detects GPU name by scraping device id from The PCI ID Repository - Hot-plugging required - Automatic backups with rsync - Uninstalling with [-uninstall] parameter - In theory this should work on OS X El Capitan 10.11 if SIP disabled (official web driver can’t be downloaded automatically yet). And last but not least… OpenCL benchmarking (clpeak). The script will install everything automatically. Show your numbers with -clpeak parameter. 1) It’s compulsory to make a fresh Yosemite 10.10.4 install and preferably Time Machine backup before you try. This is because the script needs original kext files. Note that reinstalling preserves your user account files, but erase+install doesn’t. 2) Boot into OS X without Thunderbolt cable 3) Hot-plug and run the script as before without parameter. If you have a Kepler card, you can use [-skipdriver] parameter. 4) The script will detect your eGPU (AMD or Nvidia). 5) Restart and enjoy. Uninstalling is possible, switch to a different eGPU and reinstall at any time.