So you have to change all your BIOS settings for PCIE ports to enable hotplug, then you just plug in the EXP-GDC Beast into the ExpressCard slot. Works on both

So you have to change all your BIOS settings for PCIE ports to enable hotplug, then you just plug in the EXP-GDC Beast into the ExpressCard slot. Works on both MacOS 10.12 and Windows 10. It's a Lenovo X220 ThinkPad with the BIOS modification described here: http://x220.mcdonnelltech.com/ http://x220.mcdonnelltech.com/ The BIOS mod allows me to run 16GB RAM at 1866 MHz. Also has a 500GB SSD running where the 3G card used to be, and swapped out the stock hard drive for another 500GB SSD.