Adding USB 3.0 to X220 i5 via ExpressCard? (in macOS)

Hi! I'm currently looking to buy an X220 off eBay, and I'm deciding whether I should choose the i5 or i7 variant. The i5's are much cheaper and apparently run cooler and use a bit less power, but the i7's have USB 3.0 ports, which I kind of need.

I've read that many people have added USB 3.0 ports to their i5 X220's by installing an ExpressCard with 1-2 USB ports on it. Does anyone know if this would work under macOS?

submitted by /u/LeadingSomewhere
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