x220 expresscard slot
ExpressCard - Wikipedia
Update: four (expensive) 7th/6th generation Lenovo workstations have a rare Expresscard 3.0 (8Gbps-EC3) port here . They each also have Thunderbolt 3 ports.
compatibility - How much Bandwidth does an Express Card slot on a ...
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HP ZBook 15/17 G2 has non-functional expresscard slot - HP Support Community - 4962544
As disclosed at WARNING: HP ZBook 15/17 G2 has non-functional expresscard slot (Tech|Infero DIY eGPU area) The ZBOOK 15/17 G2 series looked to be the perfect candidate for me to do EC and TB2 testing of DIY eGPUs with. Unfortunately it looks like the G2 series has a non-functional expresscard slot...