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I have a Dell Precision M4500 and I read on the manufacturer's website that it has an ExpressCard 34 slot. How can I figure out if it's 1.0 or 2.0?

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...